Volume 16 : Issue 1, March 2026

Volume 16 (1); March 2026

Research Paper

Evaluation of Copepods as an Alternative Feeding Strategy in Semi-Intensive Culture of Pacific White Shrimp (Litopenaeus vannamei)

Nurhudah M, Rahayu TH, Yanti LKW, Rahardjo S, Nuraini Y, Marlina E, Margono, Umidayati, Kiswanto A, Abrori M, Fitriadi R, and Ihtifazhuddin MI.

World Vet. J. 16(1): 01-20, 2025; pii:S232245682600001-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj1

ABSTRACT: Indonesia is the fourth-largest global shrimp exporter but faces higher production costs than Ecuador. Using copepods in semi-intensive farming offers a potential solution, as their high content of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) can enhance shrimp growth and efficiency. The present study aimed to evaluate the effects of copepods as a live-feed supplement on growth and feed efficiency of vannamei shrimp (Litopenaeus vannamei) in the semi-intensive culture. A completely randomized design was established with three treatment groups and three replications. A total of 315 post-larvae Litopenaeus vannamei were kept at a density of 35 shrimp per tank, with each tank measuring 1.3 × 1.3 × 0.73 m³ during a 50-day cultivation period. The treatment groups included a commercial feed-only control group (P1), a commercial feed with copepods inclusion (P2), and a copepods-only group (P3). The growth (absolute daily growth, absolute body weight, absolute weight/length), feed efficiency, hepatopancreas histopathology, proximate composition, and water quality (temperature, salinity, pH, dissolved oxygen, total dissolved solids, alkalinity, total ammonia nitrogen, total organic matter, total bacteria count, total vibrio count) were assessed. The current results indicated that P2 achieved the highest growth performance among the treatment groups. Furthermore, P2 provided higher nutritional value for protein and fat than P1 and P3, showing the healthiest tissue structure, mild atrophy, and sloughing, with the lowest hemocyte infiltration, supporting improved epithelial health. Water quality remained within or approximately within the recommended ranges. Therefore, combining copepods with commercial feed improved growth, survival, and feed efficiency compared with using either copepods or commercial feed alone.
Keywords: Copepod, Shrimp growth, Vanname shrimp, Water quality

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Research Paper

The Effect of a Mixture of Amino Acids and Endogenous Lipids on in vitro Oocyte Maturation of Cows

Gutnisky C, Gagneten P, Martinez S, Gadze T, Breininger E, and Cetica P.

World Vet. J. 16(1): 21-31, 2025; pii:S232245682600002-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj2

ABSTRACT: Understanding the effects of amino acid (AA) and endogenous lipid (EL) metabolism during in vitro oocyte maturation is important; however, most studies use undefined routine maturation media supplemented with glucose or an oxidative agent. The present study was conducted in two phases, with each phase consisting of two stages, and aimed to use supplemented AA (a mix of the 20 amino acids and glutamine) or EL (triacylglycerols) as unique oxidative substrates for oocytes during in vitro maturation (IVM) to understand the oocyte requirements during maturation. Cumulus-oocyte complexes (COCs) obtained from slaughtered Aberdeen Angus cows were matured in five groups to evaluate AA utilization and in the other five groups to evaluate EL utilization. The COCs were incubated in a defined medium either without oxidative substrates (negative control) or supplemented with AA, AA and salicylate as deamination inhibitor, AA and glucose (Glc), and Glc alone (positive control) to evaluate AA catabolism. To assess EL utilization, COCs were cultured with L-carnitine (β-oxidation activator), etomoxir (β-oxidation inhibitor), L-carnitine with Glc, Glc alone (positive control), and without oxidative substrates (negative control). Nuclear maturation, ammonia production, and oocyte lipid content were evaluated after maturation. Cleavage and blastocyst rates were assessed at 48 hours and seven days after fertilization. The results indicated that oocytes matured in media with AA and Glc (51% and 52%, respectively) or AA with salicylate (38%) had higher nuclear maturation rates than the control group (11.76 %), and a synergistic effect was observed in the group supplemented with AA and Glc (70 %). When AA was added to the maturation media as a unique oxidative substrate, ammonia production increased, while embryo development was observed only in the AA and Glc-supplemented group. Media with Glc (68 %) or L-carnitine with Glc (61%) increased the nuclear maturation. A higher lipid content was observed with Glc. Glc (63%) and L-carnitine with Glc (57.9%) increased cleavage rates compared with the other groups, but no group reached the blastocyst stage. Catabolism of AA, EL, or Glc alone served as an oxidative substrate and sustained bovine oocyte nuclear maturation, but they were insufficient to induce oocyte developmental competence.
Keywords: Amino acid, Endogenous lipid, Glucose, In vitro oocyte maturation, Nuclear maturation

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Research Paper

The Effect of Temperature on Survival Rate of White leg Shrimp (Litopenaeus vannamei) Infected with Infectious Myonecrosis Virus

Za IFS, Zaidy AB, Sugama K, Hasan S, Fitriadi R, Ihtifazhuddin MI, Rahayu SYS, Mahariawan IDM, and kamaruddin.

World Vet. J. 16(1): 32-42, 2025; pii:S232245682600003-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj3

ABSTRACT: Infectious myonecrosis virus (IMNV) is a significant pathogen in shrimp aquaculture, causing high mortality. Environmental factors, particularly temperature fluctuations, are known to trigger IMNV outbreaks. The present study aimed to determine the effects of hyperthermia on the survival rate and incubation period of whiteleg shrimp (Litopenaeus vannamei) infected with IMNV. The present study utilized a completely randomized design with five treatment groups and three replications. Each replication consisted of 15 shrimp, with an average weight of 9.19 ± 0.58 grams, reared in 100 L plastic containers filled with seawater at 26 ppt salinity. The treatment groups consisted of shrimp infected with IMNV via intramuscular injection and reared at temperatures of 30°C (S30, positive control group), 31°C (S31), 32°C (S32), and 33°C (S33). Additionally, a negative control group of non-infected shrimp was reared at 30°C (Sk30). The observation period lasted 10 days post-infection. The present results demonstrated that hyperthermia significantly impacted shrimp mortality and viral incubation. The highest survival rate was observed in the control group at 97.78%. Among the infected groups, the highest survival rates were recorded in S30 (51.11%) and S31 (48.89%), whereas the lowest were in S32 (28.89%) and S33 (24.44%). In the S33 treatment, higher temperatures reduced the incubation period to 2 days, whereas in the S30 treatment, it lasted for 5 days. The current findings indicated that water temperatures of 32°C and 33°C act as environmental stressors, significantly reducing IMNV incubation period and increasing the risk of mortality in Litopenaeus vannamei shrimp.
Keywords: Hyperthermia, Infectious myonecrosis virus, Incubation period, Survival rate

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Research Paper

Effects of Fermented Fish Waste and Meat-bone Scraps on Laying Performance and Profitability in Japanese Quail

Ramoso RF, Hebron IU, Taylaran RD, Alcantara CG, Gonzaga NR, Politud ERR, and Camay RM.

World Vet. J. 16(1): 43-53, 2025; pii:S232245682600004-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj4

ABSTRACT: Calcium is essential for quail growth and eggshell formation, but commercial sources are expensive. The present study aimed to evaluate fermented fish waste (FW) and meat and bone scraps (MBS) as alternative calcium sources for Japanese quail, examining their effects on growth, reproduction, egg production and quality, and economic returns. A total of 240 female quail (120 ± 10 g at 35 days post-hatch) were randomly allocated to eight dietary treatments (n = 30) in a randomized complete block design with three replications (10 quails each), comprising a formulated calcium-deficient diet (0.8% Ca of dry matter [DM]), a standard layer diet (3.0% Ca DM), and six calcium-supplemented diets using fermented substrates (50 or 100 mL/kg, sprayed onto basal feed). The feeding trial lasted 85 days and evaluated growth performance, reproductive and productive traits, egg quality, and profitability. Mineral analysis of the fermented substrates showed that MBS contained significantly higher calcium than FW (14.86 versus 11.12 mg/kg), while phosphorus and iron levels were comparable. Growth performance differed significantly among treatments at 70 (mid-lay) and 120 (peak production) days post-hatch, with 50 mL MBS/kg producing the highest body weights (180.28 g at 70 days; 229.48 g at 120 days). Reproductive traits (age at first egg, age at sexual maturity, and body weight at maturity) were unaffected by dietary treatments. Production performance and egg quality improved significantly with calcium supplementation compared to the calcium-deficient control. At 120 days, 50 mL MBS yielded the highest hen-day production (96.82%), egg weight (10.83 g), and egg mass (41.94 g) compared to all other treatments, including the standard diet. Shell thickness and albumen height with 50 mL MBS significantly exceeded those of the calcium-deficient diet and matched or surpassed those of the standard diet at both measurement times. Economic analysis showed the highest return on investment for 50 mL MBS (68.69%), comparable to the standard diet (66.06%). These results demonstrate that 50 mL/kg fermented MBS provides a practical, sustainable, and cost-effective calcium source for laying quail, achieving optimal performance across growth, production, egg quality, and economic parameters under the conditions tested.
Keywords: Bone scrap, Calcium supplementation, Circular economy, Egg production, Egg quality, Fermented fish waste, Japanese quail

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Research Paper

Prevalence of Gastrointestinal Helminths in Ducks (Anas platyrhynchos domestica) in Bali, Indonesia

Dwinata IM, Oka IBM, Apsari IAP, and Putra IPC.

World Vet. J. 16(1): 54-62, 2025; pii:S232245682600005-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj5

ABSTRACT: Helminth infections of the digestive tract in ducks (Anas platyrhynchos domestica) can cause significant economic losses, as they can lead to growth disorders, decreased egg production, and death in the case of severe infections. This study aimed to determine the prevalence and risk factors of digestive tract worms infecting ducks in Bali, Indonesia, through post-mortem examination. A total of 200 Balinese ducks (3–12 months) were examined post-mortem, obtained from six districts in the province of Bali using random sampling. The ducks were necropsied, and their digestive tracts and livers were sampled to identify the presence of the worms. The worms were collected and fixed in aceto-acetic-formalin-alcohol solution, stained with Carmine, and identified based on morphology. The relationship between the district origin, sex, and age of ducks and the infection of each helminth was analyzed using the chi-square test. The results showed that 83.5% (167/200) of ducks were infected with worms, consisting of 78.5% trematodes, 27% cestodes, and 15.5% nematodes. The identification of trematodes revealed 12 genera, including Hypoderaeum spp. (41%), Protechinostoma spp. (16%), Paramonostomum spp. (14%), Cotylorus spp. (13.5%), Apatemon spp. (11.5%), Notocotylus spp. (10.5%), Echinochasmus spp. (10%), Pseudapatemon spp. (6%), Echinostoma spp. (5%), Methorchis spp. (5%), Parorchis spp. (2.5%), and Catatropis spp. (3%). The cestodes found belonged to three genera, including Hymenolepis spp. (26%), Fimbriaria spp. (10.5%), and Cloacotaenia spp. (1%). The only nematode identified was Tetrameres spp., with a prevalence of 15.5%. The district of origin of the ducks was associated with trematode and cestode infections, whereas the age of the ducks was associated only with trematode infections. Based on these findings, this study documented the presence of 12 genera of trematodes, 3 cestodes and one nematode in ducks from Bali, Indonesia. Keywords: Bali, Cestode, Duck, Risk factor, Trematode

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Research Paper

Prevalence of Bovine Fasciolosis in the Comoe River Basin, Southwestern Burkina Faso

Vitouley SH, Zongo A, Somda MB, and Belem AMG.

World Vet. J. 16(1): 63-72, 2025; pii:S232245682600006-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj6

ABSTRACT: Fasciolosis is considered a rising zoonotic infection and remains one of the main neglected tropical diseases. The present study aimed to determine the prevalence of bovine fasciolosis in the Comoé province of southwest Burkina Faso. A cross-sectional study was conducted in three villages of the Comoé River in the Cascades region of Burkina Faso. A total of 100 zebu cattle (Bos indicus), aged between 6 and 24 months and of both sexes (excluding pregnant animals), from nine farms across three villages were randomly selected and sampled. The presence or absence of Fasciola spp. eggs in relation to the animals’ sex and origin were evaluated in the selected samples. Fecal samples were collected from each bovine rectum in a tight plastic bag, kept at +4°C, and transferred to the laboratory of the International Research and Development Center on Livestock Farming in Sub-humid Areas (CIRDES) based in Bobo-Dioulasso, Burkina Faso, for subsequent analysis. Fasciola spp. eggs were detected in fecal samples using the Malan and Visser fecal egg counting method. The present study was conducted through a systematic examination of 4,992 bovine livers (including zebu and crossbred animals, both sexes, aged 2-4 years) collected over one year at the abattoir in Banfora, the capital of Comoé Province, Burkina Faso. At the slaughterhouse, the liver flukes were identified by size and morphology. According to the results, 40% of the fecal samples were positive for Fasciola spp. infection. There was no statistically significant difference between males and females. Fasciola gigantica was detected in only 3.43% of the examined livers. Fasciolosis was found to be affected by season and sex, with higher rates in the rainy season and among females at the abattoir, Burkina Faso. The current findings confirmed the endemic presence of bovine fasciolosis in Comoé Province, characterized by a high prevalence in farms (40%) and a low rate of adult Fasciola gigantica infection in slaughtered cattle livers (3.43%).
Keywords: Bovine, Egg, Fasciola, Fecal sample, Fluke, Liver

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Research Paper

Assessment of Pork Meat Quality Following Electrical Stunning with Varying Rest Times: An Analysis of Lactic Acid Content and pH Value

Suardana IW, Suharsono H, Pinatih KJP, and Suyasa IN.

World Vet. J. 16(1): 73-79, 2025; pii:S232245682600007-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj7

ABSTRACT: The quality of pork is closely linked to the stress animals experience before slaughter. Implementing practices that ensure adequate rest and minimize stress in animals before slaughter can play a vital role in enhancing meat quality. The present study aimed to evaluate pork quality following electrical stunning with differing rest periods. A total of 24 landrace pigs, aged 5 to 7 months, were randomly assigned to four treatment groups, including pigs with no stunning and a rest period of 24 hours or more (P1), pigs with no stunning and a rest period of less than 24 hours (P2), pigs subjected to electric stunning with a rest of 24 hours or more (P3), and pigs subjected to electric stunning with a rest of less than 24 hours (P4). Muscle glycogen levels were measured using a L-lactic acid colorimetric assay kit, and pH was assessed using established methods. The present results indicated that lactic acid concentrations in pigs that rested for more than 24 hours were higher than those in pigs that rested for less than 24 hours. Lactic acid levels in the control group (without stunning) for a rest period of more than 24 hours were 2,197 ± 0.388 mmol/g protein, higher than in pigs with a rest period of less than 24 hours. Similarly, in pigs subjected to electric stunning, lactic acid levels during a rest period of more than 24 hours were 2,057 ± 0.391 mmol/g protein, higher than those in pigs with a rest period of less than 24 hours (1.622 ± 0.543 mmol/g protein). Meanwhile, pH was higher in P1 (6.04 ± 0.16) than in P2 (5.99 ± 0.14). However, pH in P4 (6.01 ± 0.45) was slightly higher than that in P3 (5.84 ± 0.21). Electrical stunning reduced muscle lactic acid levels and pH. Conversely, providing pigs with a longer rest period (> 24 hours) before slaughter has been associated with higher muscle lactic acid levels. Therefore, it is recommended to combine electrical stunning with sufficient rest periods (over 24 hours) and to keep the pigs in a spacious area before slaughter.
Keywords: Lactic acid, Meat quality, pH, Resting time, Stunning

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Research Paper

Phytochemical-Mediated Nutrient Effects of Ensiled Cassava and Sweet Potato Leaves on Transient Growth Responses in Broiler Chickens with Low Protein Diets

Ramoso Jr. GM, Hebron IU, Taylaran RD, Alcantara CG, Gonzaga NR, Politud ERR, and Camay RM.

World Vet. J. 16(1): 80-96, 2025; pii:S232245682600008-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj8

ABSTRACT: Improving the efficacy of low-protein feeding strategies is important for reducing feed costs and nitrogen emissions in broiler production. The present study aimed to evaluate whether a standard-protein broiler diet can be replaced by a low-protein diet containing 18% crude protein (CP) supplemented with ensiled cassava or sweet potato leaf meal. Ensiled cassava leaf (ECL) at 100 g kg⁻¹, ensiled sweet potato leaf (ESPL) at 100 g kg⁻¹, and ECL-ESPL blends (50 g kg⁻¹) were incorporated into both low-protein (18% CP in starter and grower) and standard-protein diets (22.5% CP in starter and 20% CP in grower). The present study used a 2 × 3 factorial design with 108 broiler chickens from day 1 to day 42. The treatment groups included ECL, ESPL, and a 50:50 blend of both protein levels, with 36 chickens in each group. Chemical analysis indicated that ECL exhibited stronger 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical-scavenging activity (IC₅₀: 33.35 versus 88.08 μg mL⁻¹) and higher total phenolics (21.43 versus 12.34 mg Gallic acid equivalent g⁻¹) compared to the ESPL group, whereas ESPL contained higher flavonoids (12.00 versus 2.86 mg Quercetin equivalent g⁻¹) compared to the ECL group. During the dietary transition phase (days 14-21), broiler chickens subjected to the low-protein diet demonstrated superior average daily gain (51.57 versus 44.91 g) and feed conversion ratio (1.78 versus 2.11) in comparison to those fed the standard-protein diet. However, from day 22 onward, broiler chickens fed the standard-protein diet grew faster than those fed the low-protein diet, resulting in higher final body weight (1,887.89 g versus 1,751.67 g, respectively). Carcass yield, dressing percentage, meat cuts, income over feed and chick cost, and return on investment did not differ among protein levels or silage sources. Overall, an 18% CP diet supplemented with either ECL, ESPL, or the ECL plus ESPL blend can replace a standard-protein diet without adverse impact on carcass yield, dressing percentage, commercial meat cuts, or economic returns, despite a moderate reduction in final body weight. These findings supported the feasibility of using low-protein diets for broiler chickens, incorporating locally available ensiled leaf meals as a cost-effective strategy for smallholder producers.
Keywords: Broiler chicken, Ensiled cassava leaf, Ensiled sweet potato leaf, Low-protein diet, Phase-dependent growth, Phytochemical compound

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Research Paper

Effects of Disinfection Methods, Antimicrobial Sensitivity, and Environmental Conditions on Bacterial Contamination of Surgical Instruments During Canine Ovariohysterectomy

Dhamayanti E, Kurniawati S, Putri SMY, and Yuscrates VA.

World Vet. J. 16(1): 97-105, 2025; pii:S232245682600009-16

DOI:https://dx.doi.org/10.54203/scil.2026.wvj9

ABSTRACT: Surgical site infections (SSIs) pose a threat to animal health and potentially compromise recovery after surgical procedures. Antimicrobial resistance (AMR) also exacerbates SSI. Therefore, preventive measures are needed to reduce the risk of SSI during surgery, as well as surveillance of bacteria and antibiotic susceptibility. The present study aimed to observe the risk factors and prevention of SSI in canine ovariohysterectomy (OH), bacterial sensitivity to antibiotics commonly used in veterinary practice, and assess the association of surgical room environment and bacterial contamination. Nine mongrel dogs underwent OH procedures, with surgical instruments (thumb forceps, scissors, and hemostatic forceps) subjected to three intraoperative disinfection methods (70% alcohol, 10% povidone-iodine, or no treatment). Each of the surgical instruments on each disinfection method was swabbed at three points in time (0, 30, and 60 minutes) intraoperatively. Environmental conditions (humidity and temperature) of the surgical room were monitored at each sampling interval. The bacterial identification was performed using conventional microbiological methods. The identified bacteria were tested for antimicrobial susceptibility to doxycycline, enrofloxacin, cefadroxil, and gentamicin using the Kirby-Bauer method. Results indicated that 70% alcohol reduced bacterial contamination in two-thirds (2/3) of replicates, compared to 10% povidone-iodine (0/3) and untreated control (0/3). The bacteria that were identified were Bacillus cereus, Bacillus megaterium, Staphylococcus aureus, and Klebsiella spp. Most of the bacteria identified were susceptible to all antibiotics tested, except Klebsiella spp., which displayed resistance to gentamicin and cefadroxil, while doxycycline and enrofloxacin remained susceptible. The bacterial contamination also might be supported by the humidity and temperature of the surgical room, which is above the standard requirement. The present study findings highlighted the importance of standardized intraoperative disinfection protocols, surveillance of antimicrobial susceptibility, and environmental control in veterinary surgical procedures.
Keywords: Antimicrobial resistance, Ovariohysterectomy, Small animal, Surgical instrument, Surgical site infection

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Research Paper

Isolation and Antimicrobial Susceptibility of Enterobacteriaceae Isolated from Wild Animals in Vietnam

Vu TTT, Dong VH, Nguyen TTH, Truong HT, Hoang TTH, Pham-Duc P, and Nguyen TT.

World Vet. J. 16(1): 106-114, 2025; pii:S232245682600010-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj10

ABSTRACT: Antimicrobial resistance has increased globally among bacteria within the family Enterobacteriaceae. The present study aimed to identify Enterobacteriaceae species isolated from wild animals in Vietnam, including sika deer, chevrotain, bamboo rat, binturong, otter, palm civet, and wildcat, and to evaluate their antimicrobial susceptibility profiles. A total of 20 samples from wild animals were subjected to biochemical characterization and species identification using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Antimicrobial susceptibility was determined by the disc diffusion method according to Clinical and Laboratory Standards Institute guidelines. A total of 42 Enterobacteriaceae isolates were identified, including Escherichia coli (E. coli; 71.4%), Enterobacter asburiae, Enterobacter bugandensis, Enterobacter hormaechei, Escherichia fergusonii, Klebsiella aerogenes, Klebsiella pneumoniae, Klebsiella variicola, and Proteus mirabilis. Most isolates were susceptible to norfloxacin (92.9%) and trimethoprim/sulfamethoxazole (88.1%), and no resistance to imipenem was detected. In contrast, resistance to ampicillin was the most common at 52.4%, followed by ciprofloxacin at 30.9%, cefotaxime at 26.2%, tetracycline at 23.8%, chloramphenicol at 21.4%, and streptomycin at 21.4%. Intermediate susceptibility was observed for doxycycline (9.5%), cefoxitin (9.5%), norfloxacin (7.1%), and gentamicin (4.8%). Among the isolates, 76.7% of E. coli and 91.7% of the remaining Enterobacteriaceae species demonstrated resistance to at least one antimicrobial agent. Seventeen distinct resistance patterns were identified among E. coli, whereas five patterns were observed among other species. Overall, 12 isolates (28.6%) were classified as multidrug-resistant, exhibiting resistance to three or more antimicrobial classes. The present findings indicated that wild animals in Vietnam carried different Enterobacteriaceae species, including multidrug-resistant strains. Consequently, wild animals could serve as a reservoir for antimicrobial-resistant bacteria, emphasizing the need for ongoing surveillance within a One Health approach.
Keywords: Antimicrobial resistance, Enterobacteriaceae, Multidrug resistance, Wild animal

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Research Paper

Effects of Organic Acids on Growth Performance, Livability, Carcass Traits, Leg Bone Qualities, and Economic Profitability in Broiler Chickens Fed Low-Protein Vegetable-Based Diets

Zaman S, Hossain MA, Akter N, Islam S, Nath SK, Mir DA, Akter N, Islam S, Khatun MM, Bahar F, and Islam MS.

World Vet. J. 16(1): 115-126, 2025; pii:S232245682600011-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj11

ABSTRACT: A variety of feed additives are widely used in the modern poultry industry for improving productivity and feed conversion efficiency. This study evaluated the effects of dietary organic acids, either butyric acid alone or in combination with acetic acid, supplemented low-protein (crude protein) vegetable diets on growth performance, livability, carcass traits, leg bone qualities, and cost-benefit of broiler production. A total of 216 unsexed one-day-old Ross-308 broiler chickens were randomly assigned to four treatments, each comprising six replicates of nine chickens. The treatments included D1_c (basal diet without OA), D1 (0.6% butyric acid), D2_c (basal diet without OA), and D2 (0.3% of butyric and acetic acid). The findings showed that the OA supplementation significantly increased live body weight (LBW) and feed intake (FI), while decreasing feed conversion ratio (FCR), both at 21 and 42 days, when compared to respective controls. Basal diets had no significant effect on LBW, FI, or FCR at either age. However, a significant interaction between basal diets and OA (A × B) was observed for FI and FCR at 21 days. Livability did not differ significantly among treatment groups. Carcass evaluation revealed that broiler chickens in the D2 group showed significantly increased dressing yield, drumstick, breast and giblet percentages, followed by D1, compared with control groups. However, neither basal diets nor A × B interaction had any significant effect on dressing yield or individual carcass parts. In terms of bone qualities, the D2 group demonstrated a significant increase in tibial bone length, width, and ash content compared with the control groups. Although basal diets significantly increased tibial phosphorus content in the D1_c group, neither basal diets nor the A × B interaction significantly affected the overall bone traits. Economically, total production cost per kg live body weight reduced and profit increased significantly in the D2 group, followed by D1, compared with controls. Basal diets and A × B interaction did not significantly influence production cost or profitability. In conclusion, supplementation with 0.30% butyric and acetic acid in low-protein vegetable-based diets enhances growth performance, carcass traits, bone qualities, and profitability without affecting livability in broiler chickens.
Keywords: Broiler chicken, Carcass, Growth, Leg bone quality, Low-protein diet, Organic acid

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Research Paper

Effects of Matrix Metalloproteinase-9-Dependent Extracellular Matrix on Remodeling Underlie Accelerated Skin Aging in Streptozotocin-induced Diabetic Rats

Mulyaningsih REM, Kartinah NT, Prijanti AR, Nugroho CMH, and Krisnamurti DGB.

World Vet. J. 16(1): 127-138, 2025; pii:S232245682600001-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj12

ABSTRACT: Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder associated with progressive aging-related alterations in multiple organs, including the skin. Nonetheless, the specific structural and molecular changes that cause skin aging in diabetes remain poorly understood in preclinical animal models. The present study aimed to establish a rat model of T2DM-induced skin aging and to investigate the relationship between matrix metalloproteinase-9 (MMP-9) expression and dermal extracellular matrix (ECM) remodeling in diabetic skin aging. A total of 12 male Sprague-Dawley rats, aged 8-9 weeks and weighing 180-250 g, were assigned to the control and T2DM groups. Rats in the T2DM group received an 8-week high-fat diet (45% fat calories) with 40% fructose, followed by low-dose streptozotocin (25 mg/kg, IP) injection to induce diabetes. Metabolic phenotype was validated using fasting blood glucose and a 2-hour post-glucose measurement. After 16 weeks, dorsal skin was collected for histological evaluation, including measurements of epidermal/dermal thickness, collagen area, and fibroblast counts, as well as molecular analysis. The MMP-9 was measured using a sandwich enzyme-linked immunosorbent assay. Diabetic rats developed sustained hyperglycemia and increased body weight, confirming a T2DM-like metabolic phenotype. Histological analysis demonstrated a significant increase in dermal thickness and a marked reduction in dermal collagen density in diabetic skin, whereas epidermal thickness and fibroblast counts were not significantly altered. The MMP-9 concentration in diabetic dermal homogenates was elevated compared with that in the control group. The current findings demonstrated that T2DM in rats was associated with early dermal extracellular matrix remodeling, characterized by increased MMP-9 levels, decreased collagen density, and dermal thickening, suggesting an association between chronic hyperglycemia and altered dermal matrix homeostasis.
Keywords: Collagen, Dermal extracellular matrix, Matrix metalloproteinase-9, Rat, Skin aging, Type 2 diabetes mellitus

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Research Paper

Challenges of Native Poultry Farming in Nilphamari District, Bangladesh

Islam S, Islam MA, Sultana S, Sarker MSK, Islam MS, and Khatun R.

World Vet. J. 16(1): 139-151, 2025; pii:S232245682600013-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj13

ABSTRACT: Poultry farming in Bangladesh is an essential part of the mixed farming system, contributing notably to household nutrition, economic development, and employment opportunities for women. The present study aimed to evaluate the current status and future prospects of local poultry (chicken and duck) farming in six sub-districts of Nilphamari, Bangladesh, to inform decisions on technological interventions and enhance the farming system. A cross-sectional survey of 210 households across six sub-districts of Nilphamari, Bangladesh, was conducted using a simple random method from July 2024 to June 2025. The current results indicated that women dominated poultry farming (86.77%), while household heads were mainly engaged in labor (29.24%), agriculture (27.14%), and business (20.95%). The literacy status of the respondents indicated that 36.19% had education below the secondary school level, 18.09% were illiterate, 11.43% could only sign, and 29.33% attained higher education levels. The average annual household income and expenditure were 252,029.52 BDT (2059.90 USD) and 166,062.85 BDT (1357.28 USD), respectively. Most households (55.71%) maintained small flocks, averaging seven native chickens each, while 14.26% of households reared ducks and only 3.33% reared commercial chickens. Native chickens had an average annual egg production of 64 eggs with a mean egg weight of 35.83 g, while native ducks produced 108 eggs annually with an average egg weight of 55.23 g. The majority of farmers (97.14%) practiced semi-intensive systems, with rice and broken rice being the main feed. Vaccination coverage was extremely low for chickens (17.14%) and ducks (9.68%), leading to high prevalence of Newcastle disease (75.24%) in chickens, followed by fowl pox (40.95%), fowl cholera (25.24%), infectious coryza (21.90%), and coccidiosis (21.43%). Prevalence of avian influenza was low (4.28%), and duck plague was reported at 35.48% in ducks. Morbidity and mortality rates were 66.64% and 35.10% for chickens, and 63.68% and 24.37% for ducks, respectively, due to disease, nutritional scarcity, and predation. Major constraints in poultry farming included predatory attacks, disease outbreaks, feed costs, and knowledge gaps. Poultry farming remains a vital livelihood strategy, highlighting the urgent need for training, technological assistance, and enhanced breeds to boost productivity and sustainability in the study area.
Keywords: Constraint, Native chicken, Poultry production, Vaccination

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Research Paper

Prevalence and Antibiotic Resistance of Salmonella spp. in Pigeons Farmed at Bac Ninh Province, Vietnam

Huong CTT, Oanh TL, Tra VTT, and Thai TH.

World Vet. J. 16(1): 152-158, 2025; pii:S232245682600014-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj14

ABSTRACT: Pigeons are known to be the potential reservoir for several pathogenic microorganisms, including Salmonella, E. coli, Chlamydia spp., and Cryptococcus spp. This study aimed to determine the prevalence and antibiotic resistance of Salmonella in fecal samples from pigeons raised in Northern Vietnam. From January to December 2024, 128 fresh fecal samples were collected from 32 different pigeon farms in Bac Ninh province, Vietnam, for Salmonella isolation. Fecal samples were cultured on peptone buffer and selective media such as rappaport-vassilidis soybean broth and xylose lysine deoxycholate agar; suspected Salmonella colonies were confirmed by biochemical tests and InvA gene identification. Results showed that 40 out of 128 samples (31.3%) were positive for Salmonella. The isolated Salmonella strains were tested for antibiotic susceptibility by agar diffusion method for ampicillin, meropenem, cefotaxime, ceftazidime, doxycycline, tetracycline, gentamicin, streptomycin, nalidixic acid, ciprofloxacin, norfloxacin, sulfonamide, and trimethoprim/sulfamethoxazole. The isolates exhibited the highest resistance rate to tetracycline (67.5%), followed by ampicillin and sulfonamide (62.5%). Cefotaxime, streptomycin, and trimethoprim/sulfamethoxazole were resistant at rates of 52.0%, 47.5%, and 45.0%, respectively. Resistance to ciprofloxacin, gentamicin, doxycycline, nalidixic acid, and chloramphenicol ranged from 20.0% to 35.0%. No Salmonella strains were observed to be resistant to ceftazidime, meropenem, and norfloxacin. The current results indicated that 92.5% (37/40) isolates were resistant to at least one antibiotic, with 26 different antibiotic resistance patterns. Twenty-eight (70.0%) strains were identified as multidrug-resistant (MDR), with resistance to 3-4 antibiotic classes, and 5-6 antibiotic classes and 7 antibiotic classes found in 11 (27.5%), 12 (30.0%), and 5 (12.5%) of the isolates, respectively. Overall, the findings of the current study indicated a high prevalence of antibiotic-resistant Salmonella in pigeon farms, with many strains identified as MDR.
Keywords: Antibiotic resistance, InvA, Pigeon, Salmonella

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Research Paper

Microbiological Quality and Adulterants of Cattle Milk in Egypt

Soliman MMH, Abuelnaga ASM, Abd EL-Razik KAE-H, Kandil MM, and Hassan ER.

World Vet. J. 16(1): 159-170, 2025; pii:S232245682600015-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj15

ABSTRACT: Milk is a rich, highly nutritious food; therefore, it is essential to ensure its purity by eliminating harmful microbes and adulterants that could affect public health. This cross-sectional, laboratory-based analytical study aimed to evaluate the hygienic quality of milk and detect chemical adulterants, with a focus on differentiating buffalo milk from cow milk by utilizing PCR to detect cow and buffalo DNA. A total of 110 milk samples, including raw milk, pasteurized milk, and milk powder from milk shops and dairy companies in Cairo and Giza governorates in Egypt, were collected. The present findings revealed that raw milk exhibited the highest levels of standard plate count (7 × 10⁵ ± 1.7 × 10⁶CFU/mL), Staphylococcus aureus (1.9 × 10³ ± 2.9 × 10³CFU/mL), coliforms (2.8 × 10² ± 3.1 × 10²CFU/mL), and Escherichia coli (E. coli) O157 (7.4 × 10 ± 7.8 × 10) and yeast (1.7 × 10² ± 1.7 × 10²CFU/mL), indicating poor hygiene and presenting significant public health concerns. Pasteurized milk and milk powder exhibited superior but variable microbial quality, although mold contamination levels remained consistent across all milk sample types. Sugar, soap, starch, salicylic acid, and formalin were detected at 2%, 6%, 16%,20%, and 6% in raw milk, respectively. Starch was found at 2% and 10% in pasteurized milk and milk powder, and salicylic acid was detected at 10% in milk powder. In the current study, 40% of the raw milk was cattle milk, 50% was buffalo milk, and 10% was mixed milk. In addition, 50% of the pasteurized milk was from cows, 26% from buffalo, and 24% was mixed milk from cows and buffalo. Milk powder was 100% from cows. The current results indicated that although pasteurized milk and milk powder are safer choices, raw milk poses notable chemical and microbiological risks, underscoring the need for stronger regulations to reduce milk contamination.
Keywords: Adulteration, Milk, PCR, Total bacterial count, Total fungal count

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Research Paper

Influences of Demographic Factors on Knowledge, Attitudes, and Practices Related to Animal Welfare among Pet Owners in Vietnam

Minh DLT, Dat ND, Giang NTH, and Minh TX.

World Vet. J. 16(1): 171-181, 2025; pii:S232245682600016-16

DOI: https://dx.doi.org/10.54203/scil.2026.wvj16

ABSTRACT: Animal welfare has become an increasingly important issue in rapidly urbanizing societies, particularly in developing countries where pet ownership is expanding. This study was conducted to examine the influence of demographic factors on pet owners’ knowledge, attitudes, and practices (KAP) related to animal welfare in Nghe An Province, Vietnam, in 2025 and to analyze the relationships among knowledge, attitudes, and caregiving behaviors. A cross-sectional study design was employed, involving 297 pet owners who were surveyed using a semi-structured questionnaire. The results indicated that overall knowledge, attitudes, and practices regarding animal welfare were moderate, with mean scores of 3.18 ± 0.93, 3.28 ± 0.94, and 3.25 ± 0.93, respectively. No statistically significant associations were observed between demographic characteristics (gender, age, educational level, occupation, and income) and the knowledge, attitude, or practice scores in the adjusted regression models, except for pet ownership experience and the purpose of pet keeping. The results indicated that knowledge had a positive effect on attitudes and practices. Attitudes were identified as the strongest predictor of animal welfare practices. The results confirmed that attitudes partially mediated the relationship between knowledge and practices, with a statistically significant indirect effect. These findings suggested that improving knowledge alone is insufficient to enhance animal welfare practices, and effective interventions should prioritize attitude change and strengthen the role of community veterinary services in promoting responsible pet care.
Keywords: Behavioral determinant, Companion care, Mediation analysis, Responsible ownership

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