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Prof. Dr. Ir. Komang G. Wiryawan
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Tropical Animal Science Journal
Published by Institut Pertanian Bogor
ISSN : 2615787X     EISSN : 2615790X     DOI : -
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Energy
ropical Animal Science Journal (Trop. Anim. Sci. J.) previously Media Peternakan is a scientific journal covering broad aspects of tropical animal sciences. Started from 2018, the title is changed from Media Peternakan in order to develop and expand the distribution as well as increase the visibility of the journal. The journal is published three times a year in April, August, and December by Faculty of Animal Science, IPB University (Bogor Agricultural University), associated with Animal Scientist's Society of Indonesia. The first edition with the new title will be published in April 2018 edition (Vol 41 No 1 2018), while the previous edition (up to 2017 edition) will still use Media Peternakan as the title and could be accessed in the old website (http://medpet.journal.ipb.ac.id/). This journal has been accredited by National Journal Accreditation (ARJUNA) Managed by Ministry of Research, Technology, and Higher Education, Republic Indonesia with First Grade (Sinta 1) since year 2018 to 2022 according to the decree No. 30/E/KPT/2018.
Arjuna Subject : -
Articles 439 Documents
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Performance of Lambs Born to Energy- and Protein-Supplemented Ewes During Gestation and Lactation N. C. Silva; S. L. S. Cabral Filho; I. O. M. A. Freitas; F. C. Rocha; A. M. Azevedo; V. R. Rocha Júnior; M. D. Ribeiro
Tropical Animal Science Journal Vol. 49 No. 3 (2026): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2026.49.3.215

Abstract

Maternal nutrition and supplementation during gestation and lactation improve fetal development, survival, and growth of lambs. The aim of this study was to evaluate the effects of energy and protein supplementation in the diet before, during, and in the final third of gestation and lactation, within a synchronized breeding system, on the health and performance of lambs. Forty Santa Inês × Dorper ewes, averaging ten months of age and two previous births, were distributed in a completely randomized design with four treatments: mineral supplementation only, supplementation initiated before breeding, supplementation starting after pregnancy confirmation, and supplementation restricted to late gestation. Supplements were provided daily at 4 pm at 1% of body weight (BW), adjusted every 15 days when ewes were weighed. The experimental period lasted 60 days, with 10 days of adaptation. Variance analysis was performed in subdivided plots, and the means were compared using Tukey's test at 5% probability. Concentrated supplementation altered (p<0.0072) birth weight 3.79 kg, colostrum intake, daily gain (p<0.0028) 242.39 g/animal/day, morphometric measurements, eggs per gram of feces, protein and energy metabolic profiles, and cortisol levels in lambs. There was no difference in lambing rate, litter type, sex, fecal score, or mineral metabolism. However, supplementation begun 20 days before breeding and after pregnancy confirmation improved anthelmintic response 272.49 EPG and produced heavier lambs at weaning 20.78 kg. Maternal energy and protein supplementation, especially when started before breeding or after pregnancy confirmation, improves lamb growth, metabolic status, and parasitic resistance.
Polymorphisms in the Leptin Receptor (LEPR) Gene and Their Association with Growth and Reproductive Traits in Indonesian Sheep Rojib; C. Sumantri; A. Gunawan
Tropical Animal Science Journal Vol. 49 No. 3 (2026): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2026.49.3.191

Abstract

The leptin receptor (LEPR) gene is a potential gene associated with growth and reproductive traits in livestock. However, studies on local Indonesian sheep are very rarely conducted. This study aimed to investigate the LEPR gene polymorphism and its association with growth and reproductive traits in Indonesian sheep. A total of 553 DNA samples were used to identify LEPR gene polymorphisms in Indonesian sheep populations. The sheep population used was 313 crossbred lambs (Garut × Garut, Dorper × Garut, Batur × Garut, and Suffolk × Garut) observed to determine the association of the LEPR gene with growth traits, while 240 Garut ewes were also examined to determine the association of the LEPR gene with reproductive traits. The genetic variation of sheep breeds was assessed using the PCR-RFLP technique with the restriction enzyme Aci1. The correlation of growth and reproductive Traits associated with Genotypes was assessed using a General Linear Model (GLM). The result indicated that the LEPR gene was polymorphic in Indonesian sheep breeds and produced two alleles (A and C) and three genotypes (AA, AC, and CC) according to the Hardy-Weinberg Equilibrium. The polymorphisms of the LEPR gene were statistically significant in association with the weight of the lamb at birth and the weight of the lamb at weaning (p<0.05). The lambs that were homozygous AC had significantly higher births and weaning weights (p<0.05) than those lambs with the AA genotype. The LEPR polymorphisms were not found to be associated with average litter size or offspring mortality. These findings indicate that the LEPR gene is a promising candidate marker for improving growth performance, particularly birth weight and weaning weight, in Indonesian sheep.
Breed-Specific Variations in Blood Metabolites and Cortisol Reduction in Response to Organic Mineral Supplementation in Simmental and Holstein Calves C. Uyarlar; A. Rahman; E. E. Gültepe; İ. S. Çetingül; Ü. Özçınar; M. U. Akhtar; İ. Bayram
Tropical Animal Science Journal Vol. 49 No. 3 (2026): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2026.49.3.223

Abstract

Early life immunity and stress regulation are critical for the health and survival of newborn calves. Trace minerals like selenium, zinc, and chromium, especially when obtained from organic sources, play an important role in immune and defense systems and in stress physiology. This study examined the effects of supplementing Holstein and Simmental calves with a blend of organic minerals (chromium, selenium, and zinc) on immune and stress responses and blood metabolites. Twenty Holstein and 20 Simmental calves were divided into four groups in a 2 × 2 factorial arrangement, with breed as the first and organic mineral supplementation as the second factor. In addition to milk, each calf received a mixture of organic selenium, chromium, and organic zinc (0.5 g each) orally for 21 days after birth. Calves in the control group did not receive any organic mineral supplement. Blood samples were collected from the jugular vein of all calves seven times: on the day of birth, after 3 days, and then once per week until weaning after the completion of oral mineral supplementation. Serum alanine transaminase, aspartate transaminase, gamma glutamyl transferase, high-density lipoprotein, low-density lipoprotein, and total cholesterol concentrations were 27%, 19.1%, 21.2%, 15.5%, 12.5%, and 13% higher, respectively, in Simmental calves than in Holstein calves, during the first week after birth. The addition of an organic mineral mixture to drinking milk did not affect blood metabolites in either breed (p>0.05), except for a 35% decrease in serum cortisol levels in both breeds during week 3 (p<0.021). Overall, it was concluded that organic minerals, in addition to milk, may have protective potential against stress by reducing serum cortisol levels during periods of stress in newborn calves of both Simmental and Holstein breeds.
Willingness to Pay for Halal-Certified Livestock Products in South Kalimantan: An Extended Theory of Planned Behavior Approach H. Apedro; M. Riyadhi; M. Y. Syihabuddin; A. S. Imanullah; N. Mufidah; M. Archadiya; M. Yuniar
Tropical Animal Science Journal Vol. 49 No. 3 (2026): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2026.49.3.269

Abstract

Halal certification has become a key signal of religious compliance and quality assurance in Muslim-majority food markets, yet consumers’ willingness to pay (WTP) a price premium for certified livestock products remains unevenly understood at the local level. This study examined WTP for halal‐certified meat, poultry, eggs, and milk in South Kalimantan, Indonesia, using an extended Theory of Planned Behavior (TPB) that incorporated religious commitment as an additional driver and moderator. Primary cross-sectional data were collected via an online questionnaire from 300 Muslim consumers, screened for recent purchases of livestock products, and were analyzed using partial least squares structural equation modelling. The model connected attitude, subjective norms, perceived behavioral control, and religious commitment with WTP, and examined whether religious commitment enhanced the influence of social pressure and perceived control on WTP. The results showed that attitude was the most robust predictor of willingness to pay, followed by perceived behavioral control and subjective norms, while religious commitment exerted a smaller but significant direct effect on WTP. Religious commitment enhanced the positive relationships between subjective norms and WTP as well as between perceived behavioral control and WTP. These findings indicated that the acceptance of prices for halal-certified livestock products was influenced by positive assessments, perceived purchase convenience, and the extent of consumers' religious commitment. The study concluded that policies and marketing methods that increased the visibility, credibility, and alignment of certification with customers' religious beliefs could elevate WTP for halal-certified livestock products.
Characteristics and Kinematics of Fresh Belgian Blue Semen and Its Resistance to Frozen–Thaw Using Different Extenders A. M. N. Maulidyah; M. Agil; S. Said; T. P. Nugraha; R. I. Arifiantini
Tropical Animal Science Journal Vol. 49 No. 3 (2026): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2026.49.3.208

Abstract

Extenders are used to preserve semen quality during storage. The Belgian Blue is a cattle breed known for its high dressing percentage; however, male reproductive performance is relatively low due to small testes size. This study aimed to analyze the characteristics and kinematics of fresh and frozen Belgian Blue semen. Fresh semen samples were collected from four Belgian Blue bulls, and their quality was assessed macroscopically, microscopically, and kinematically using portable computer-assisted sperm analysis (CASA) immediately after collection. Semen samples with progressive sperm motility ≥70% were diluted with the following extenders: Tris–egg yolk (TEY) and the commercial extenders AndroMed®, BoviFree®, and Steridyl®. CASA results showed that bulls differed significantly in ejaculate volume, color, consistency, sperm kinematics, including velocity curvilinear (VCL), velocity straight-line (VSL), and velocity average path (VAP), and sperm motility; however, none of these variables differed among frozen–thawed semen samples treated with the different extenders. In contrast, total motility, slow motility, and immotile sperm in frozen–thawed semen differed significantly between bulls. In conclusion, the characteristics of fresh Belgian Blue semen vary between individuals. Moreover, TEY, AndroMed®, BoviFree®, and Steridyl® showed comparable protective capabilities for frozen–thawed semen.
Optimal Post-Hatch Holding Time Maintains Growth, Gut Integrity, Oxidative Balance, and Immunity in Broilers B. Syamsuryadi; E. Widodo; L. E. Radiati; Khaeruddin; Rifa&#039;i; Suyadi
Tropical Animal Science Journal Vol. 49 No. 3 (2026): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2026.49.3.260

Abstract

Delayed access to feed after hatching can increase oxidative stress and disrupt intestinal function and immunity in broiler chickens. This study evaluated the physiological responses of broilers subjected to different post-hatch holding times under uniform vitamin E–selenium–supplemented diets. A total of 200 Cobb 500 chicks were assigned to four holding time treatments (24, 36, 48, and 60 hours), with five replications per treatment and ten birds per replication, and reared for 35 days under tropical conditions. All birds received a diet supplemented with vitamin E (250 mg/kg) and selenium (1 mg/kg). Observed parameters included growth performance, intestinal histomorphology, oxidative stress indicators (MDA and H/L ratio), and CD4⁺ and CD8⁺ T cell expression. Results showed that holding times of ≤36 hours maintained better feed intake, body weight gain, villus height, and oxidative balance, with the highest CD4⁺/CD8⁺ ratio observed at 36 hours. In contrast, prolonged holding times (48–60 hours) increased MDA and H/L ratios, reduced intestinal surface area, and decreased T cell activity despite antioxidant supplementation. These findings indicate that a holding time of ≤36 hours is critical for maintaining intestinal integrity, oxidative stability, and immune competence in broilers reared under tropical conditions.
Mangostin-Rich Mangosteen Pulp Extract Improves Lipid and Protein Metabolism in Meat Goats A. Tiantong; P. Khoinoi; K. Sasiwimonrit; S. Saengwong; W. Inyawilert; S. Khianngam; C. Lumsangkul
Tropical Animal Science Journal Vol. 49 No. 3 (2026): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2026.49.3.232

Abstract

The use of plant-derived bioactive compounds as natural feed supplements has gained increasing attention in ruminant production because of their potential to promote animal health and reduce the reliance on synthetic supplements and antibiotics. This study evaluated the effects of dietary supplementation with mangosteen peel powder (MPP) and mangosteen pulp extract containing 10% mangostin (MG10) on growth performance, hematological parameters, and metabolic profiles in meat goats. Overall, 25 male goats were divided into control, 1% MPP (MPP1), 2% MPP (MPP2), 1% MG10 (MG10-1), and 2% MG10 (MG10-2) groups. Hematological, serum lipid and sugar, serum protein, and liver function analyses were performed using blood samples, and feed intake and growth performance were examined. Growth performance did not differ significantly among groups; however, daily feed intake was significantly higher (p = 0.030) in the MG10-1 and MG10-2 groups than in the control group. Hemoglobin levels and red blood cell counts were unaffected by treatment and remained within normal ranges across all groups. MPP consumption increased aspartate aminotransferase activity and blood sugar levels. Conversely, MG10 supplementation, especially MG10-2, significantly elevated high-density lipoprotein (p = 0.007) and albumin levels (p = 0.014), whereas MG10-1 increased blood urea nitrogen and albumin levels. Low-density lipoprotein and cholesterol levels remained unchanged after supplementation. Overall, MG10 demonstrated greater potential than MPP as a functional feed additive because of its beneficial effects on lipid and protein metabolism. Thus, MG10 is a promising natural supplement for improving metabolic health and optimizing feed utilization in livestock production systems.
Screening the CLA Producing Lactic Acid Bacteria Isolated from Rumen Goats  and Their Effects on Ruminal In Vitro Fermentation L. A. Oluodo; P. Hnokaew; P. Thirawong; S. Umsook; N. S. Fitriyah; C. Phatsara; C. Lumsangkul; N. Montha; S. Yammuen-Art
Tropical Animal Science Journal Vol. 49 No. 3 (2026): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2026.49.3.240

Abstract

Ruminant-Derived products are a major dietary source of conjugated linoleic acid (CLA), a bioactive fatty acid associated with numerous health benefits. However, the natural biosynthesis of CLA in the rumen is often limited by extensive biohydrogenation of unsaturated fatty acids, necessitating strategies to enhance its synthesis through microbial manipulation. This study aimed to identify CLA-producing lactic acid bacteria (LAB) from goat rumen fluid and evaluate their effects on in vitro rumen fermentation characteristics. A total of 140 LAB isolates were obtained from rumen fluid of lactating goats, with 23 isolates demonstrating CLA production ranging from 9.0 to 12.3 μg/mL after 24 h of incubation in MRS broth supplemented with linoleic acid. Molecular identification revealed five unique LAB species: Lactobacillus fermentum (n=15), Lactobacillus plantarum (n=4), Pediococcus acidilactici (n=2), Lactobacillus argentoratensis (n=1), and Lactobacillus pentosus (n=1). L. plantarum-R11 was identified as the highest CLA producer (>12.0 μg/mL) and adopted for in vitro ruminal fermentation assessment. Four treatments: control (TMR), TMR supplemented with L. plantarum-R11 (LP; 10⁸ CFU/mL), TMR supplemented with 2% sunflower oil (SFO), and TMR supplemented with both SFO and LP (LPSFO). The LPSFO group significantly (p<0.05) increased cumulative gas production at 72 h (95.51mL/0.2 g DM) and 96 h (103.47 mL/0.2 g DM) compared to the control. Similarly, the LPSFO group had the highest ammonia-nitrogen content (13.15 mM), while pH remained stable across all treatments. The volatile fatty acid (VFA) profiles, fatty acid profiles, and total ruminal CLA content were similar across treatments. Butyrivibrio fibrisolvens appears more prominent in the LPSFO group on heatmap visualization, a bacterium associated with ruminal biohydrogenation and CLA metabolism. Our findings suggest that L. plantarum-R11 primarily functions as a rumen modulator, influencing rumen microbial ecology and promoting beneficial shifts in microbial community composition that may improve fermentation capacity.
Performance, Body Composition, and Behavior of Lambs Consuming Different Extruded Roughage to Concentrate Ratios M. T. S. Siqueira; K. A. Oliveira; P. H. C. Ribeiro; L. C. Araújo; M. R. Oliveira; L. E. G. Vilaça; L. O. Faria; G. L. Macedo Júnior
Tropical Animal Science Journal Vol. 49 No. 3 (2026): Tropical Animal Science Journal
Publisher : Faculty of Animal Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5398/tasj.2026.49.3.252

Abstract

High levels of roughage in the diet reduce energy density and limit voluntary intake due to ruminal physical constraints. In this context, extrusion processing can improve digestibility and enable greater fiber inclusion in the diet, thereby improving animal performance. The objective of this study was to evaluate the productive performance, body composition, and ingestive behavior of lambs that were fed different proportions of extruded roughage to concentrate (R:C). Twenty lambs, weighing 25.0 ± 2.8 kg and aged 120 ± 8 d, were distributed in a completely randomized design and fed one of four proportions of roughage to concentrate: 30:70; 40:60; 50:50; or 60:40. Lambs were housed in collective pens throughout the experimental period. Body weight (BW) and body condition score (BCS), body conformation (in vivo biometric measurements), average daily gain (ADG, g/d), and in vivo carcass characteristics were not influenced by the treatments (p>0.05). An increase in roughage levels linearly increased total chewing time (TCT) (p<0.05). In contrast, idle time (IT) decreased linearly (p<0.05). There was a quadratic and positive linear effect of evaluation day (p<0.05) for BW, BCS, in vivo biometric measurements, ADG during the periods between 15–30 d (p=0.03) and 75–90 d (p<0.05), and in vivo carcass characteristics (p<0.05). There was an interaction between R:C ratio and the day of assessment for loin eye area, with day 84 superior to day 0 (p<0.05). The inclusion of higher levels of roughage in fully extruded diets increases TCT and decreases IT without affecting productive performance or body composition in sheep.

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