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Paulus Klau Tahuk
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Program Studi Peternakan, Fakultas Pertanian, Universitas Timor Jln. El Tari, Km-9, Kefamenanu, Timor Tengah Utara, Nusa Tenggara Timur, Indonesia
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Journal of Tropical Animal Science and Technology
Published by Universitas Timor
ISSN : -     EISSN : 2685452X     DOI : https://doi.org/10.32938/jtast.v1i1.290
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Focus dan scope Journal of Tropical Animal Science and Technology mencakup berbagai keilmuan yang berhubungan dengan ternak sapi, kerbau, domba, kambing, babi, kuda, dan unggas. Artikel yang dapat diterbitkan oleh JTAST meliputi sistem produksi ternak potong dan unggas, genetika dan pemuliaan ternak, fisiologi dan reproduksi ternak, nutrisi dan teknologi makanan ternak, teknologi hasil ternak, bioteknologi ternak, tingkah laku dan kesejahteraan ternak, lingkungan hewan, serta sosiol ekonomi peternakan.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Hewan dan Zoologi
Articles 110 Documents
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Validation of Analysis Methods for Phosphorus in Chicken Meat and Fresh Cow's Milk Using Microwave Destruction and Spectrophotometry Microplate UV-VIS Hadianto, Ikhwan; Kusumawati, Siska Devi; Nurlatifah; Rafif, Muhammad Rio; Ispitasari, Rina
Journal of Tropical Animal Science and Technology Vol. 7 No. 3 (2025): Journal of Tropical Animal Science and Technology
Publisher : Animal Husbandry Study Program, Faculty of Agriculture, Timor University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v7i3.10311

Abstract

Phosphorus content in animal-derived foods is an important indicator of nutritional value and food safety. This study validated a method for phosphorus analysis in chicken meat and fresh cow’s milk using wet digestion based on microwave digestion and microplate UV-Vis spectrophotometry with the principle of molybdenum blue complex formation by ascorbic acid at a wavelength of 880 nm. Method performance was evaluated according to ISO/IEC 17025:2017. The validation parameters included linearity and linear range, sensitivity comprising the limit of detection (LOD) and limit of quantification (LOQ), precision comprising repeatability and intermediate precision, as well as accuracy. The calibration curve showed good linearity within the range of 2–12 ppm (r² = 0.998). The LOD and LOQ values were 0.29 and 0.97 mg/L for chicken meat, and 0.17 and 0.57 mg/L for cow’s milk, respectively. Precision testing resulted in repeatability and intermediate precision RSDs of 2.00% and 2.18% for chicken meat, and 2.62% and 2.14% for cow’s milk. Accuracy, determined by recovery analysis, showed values of 97.14% for chicken meat and 103.15% for cow’s milk. These results demonstrate that the validated method meets the acceptance criteria of ISO/IEC 17025. The method provides acceptable linearity, sensitivity, precision, and accuracy, and can be applied for routine phosphorus analysis in meat and milk matrices. Keywords: Phosphorus, chicken meat, cow’s milk, method validation, UV-Vis spectrophotometry
Analysis of Cholesterol Levels of Free-Range Chicken Meat With Turmeric Flour Supplementation Heraini, Dela; Rohayeti, Yeti
Journal of Tropical Animal Science and Technology Vol. 7 No. 3 (2025): Journal of Tropical Animal Science and Technology
Publisher : Animal Husbandry Study Program, Faculty of Agriculture, Timor University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v7i3.10556

Abstract

This study aimed to determine the effect of dietary turmeric (Curcuma longa) supplementation on the cholesterol profile of native chicken meat. Five treatments (control and four levels of turmeric inclusion) with five replications each were used. Data were analyzed using one-way ANOVA. The results showed that turmeric supplementation significantly affected meat cholesterol content (F = 16.302; p < 0.001). The highest cholesterol level was observed in the control group (67.06 ± 4.86 mg/100 g), while the lowest was in treatment 3 (41.57 ± 11.07 mg/100 g). Furthermore, crude protein and fat content of the meat also showed significant differences among treatments. These findings indicate that turmeric powder can be applied as a functional feed to produce native chicken meat with lower cholesterol content.
Correlation Between Chest Girth, Body Length, and Body Height on Wither Weight of Rote Sheep Ewes Setyani, Ni Made Paramita; Nalley, Wilmientje Marlene; Hine, Thomas Mata; Riwu, Agustinus Ridlof; Uly, Kirenius; Kune, Petrus; Bette, Yustiany Yuliana; Lawa, Alvrado Bire; Mulik, Simon Edison; Banamtuan, Adyanto Nessy; Riwu, Roni Markus Jami; Zulfa, Yanna Nailla; Listyadi, Rut
Journal of Tropical Animal Science and Technology Vol. 8 No. 1 (2026): Journal of Tropical Animal Science and Technology
Publisher : Animal Husbandry Study Program, Faculty of Agriculture, Timor University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v8i1.10617

Abstract

This study aimed to analyze the relationship between linear body measurements including chest girth (CG), body length (BL), and wither height (WH) and body weight (BW) in Rote sheep ewes across different age groups to determine the most reliable predictor of body weight. The research employed a quantitative method through direct field measurements and weighing. Data collected including vital statistics (CG, BL, WH) and BW from Rote sheep ewes categorized into three age groups (I0, I2, and I4). The data were analyzed statistically using correlation coefficient (r), the coefficient of determination (R²), and bias analysis to evaluate the accuracy of weight estimation. The results revealed that chest girth exhibited the highest correlation with body weight, particularly in the I0 group (r = 0.93; R² = 86.05%), indicating a strong positive relationship and high predictive accuracy. Body length showed a moderate relationship (r = 0.87; R² = 76.11%) in the same group, while wither height demonstrated a relatively weaker correlation (r = 0.73; R² = 53.94%). Across all age groups, the predictive strength of body measurements decreased with increasing age, suggesting that skeletal growth contributes less to body weight variation in mature sheep. In conclusion, chest girth was identified as the most accurate and reliable linear measurement for predicting body weight in Rote sheep ewes, particularly in younger age groups, and can therefore be used as a practical and non-invasive tool for estimating livestock weight.
The Influence of Additional Feeding (Sproads) on the Microscopic Quality of Spermatozoa of Bali Caws in BIBD Banyumulek, West Nusa Tenggara Province Munandar, Imam
Journal of Tropical Animal Science and Technology Vol. 8 No. 1 (2026): Journal of Tropical Animal Science and Technology
Publisher : Animal Husbandry Study Program, Faculty of Agriculture, Timor University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v8i1.8082

Abstract

This study aims to determine the effect of supplementary feeding of bean sprouts on the microscopic quality of Balinese cattle spermatozoa at the Regional Artificial Insemination Center of West Nusa Tenggara Province. Microscopic semen evaluation includes volume, mass movement, individual movement, motility and concentration. The design used was a complete randomized design (CRD) and data analysis using Anova which was further tested using Duncan. The mass movement of Balinese spermatozoa in P1 and P2 has a percentage value of 67% (+++), which indicates that the spermatozoa move to form large and progressive waves. Individual motion in P2 produces a very progressive motion with the highest percentage of 60%. The results of the analysis of volume, motility and concentration of Balinese spermatozoa showed significantly different results in P2, namely the treatment with the addition of 4 kg of bean sprouts. Based on the results of this study, it shows that there is an effect of supplementary feeding of bean sprouts with the treatment of 4 kg per week on the microscopic quality of Balinese spermatozoa at the Regional Artificial Insemination Center of NTB Province.
The Effect of Acetic Acid Solution Application on Duck Eggs Shell Strength and Incubation Duration During the Critical Hatching Period Akbar Satria Bahari
Journal of Tropical Animal Science and Technology Vol. 8 No. 1 (2026): Journal of Tropical Animal Science and Technology
Publisher : Animal Husbandry Study Program, Faculty of Agriculture, Timor University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v8i1.9446

Abstract

This study aimed to investigate the effect of different levels of acetic acid solution application on duck eggs on eggshell strength and hatching time. The materials used in this study were 180 hatching duck eggs (1–7 days old, weighing 65–75 g) from 16–18week old parent ducks. An experimental method with a Completely Randomized Design (CRD) was employed as the research design. The study consisted of three acetic acid treatment groups (P0: 0%, P1: 10%, P2: 20% acetic acid) and 6 replicates, with each experimental unit using 10 eggs. The variables measured in this study were eggshell strength (MPa) and egg hatching time (hours). Eggshell strength and hatching time data were analyzed using analysis of variance (ANOVA) and orthogonal contrast as a post-hoc test. The results showed the mean values of eggshell strength (MPa) for each treatment as follows: P0 (0.233 ± 0.022), P1 (0.125 ± 0.013), and P2 (0.144 ± 0.031); and hatching time (hours): P0 (650.438 ± 9.714), P1 (622.438 ± 5.519), and P2 (635.503 ± 2.182). Analysis of variance revealed a highly significant difference (P<0.01) in both variables due to the acetic acid application. Orthogonal contrast tests showed no significant difference in eggshell strength between treatments P1 and P2, while there was a highly significant difference (P<0.01) in hatching time between P1 and P2. It can be concluded that acetic acid application significantly reduces eggshell strength and accelerates the hatching of duck eggs. The treatment with a 10% acetic acid concentration demonstrated the most optimal effectiveness in accelerating hatching.
Quantitative Factors of Production Parameters Affecting Broiler Performance Index Akbar Satria Bahari; Novie Andri Setianto; Yusmi Nur Wakhidati; Elly Tugiyanti; Rahayu Widiyanti
Journal of Tropical Animal Science and Technology Vol. 8 No. 1 (2026): Journal of Tropical Animal Science and Technology
Publisher : Animal Husbandry Study Program, Faculty of Agriculture, Timor University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v8i1.9759

Abstract

This study aims to analyze the effects of quantitative production parameters on the Performance Index (PI) of broiler chickens. Five key variables were examined: mortality, culling, feed conversion ratio (FCR), final body weight, and harvesting age. The analysis utilized secondary historical data from 17 production cycles of broiler chickens at PT XYZ between 2021 and 2023. Multiple linear regression was employed after satisfying classical assumption tests. Results indicate that all independent variables significantly influenced PI both simultaneously (p < 0.05) and partially. The adjusted R-squared value of 99.81% demonstrates that the model explains nearly all variation in the performance index. Partially, final body weight had the highest positive impact on PI (coefficient +223.11), followed by FCR (-184.84), harvesting age (-10.41), culling (-3.61), and mortality (-3.238), all with negative effects. These findings highlight the critical role of production parameter control in optimizing broiler performance efficiency.
Application of Technical Aspects of Animal Health in the Management of Maintenance of Beef Cattle in Seteluk District, Regency West Sumbawa Mudhita, Ida Ketut; Rosi Kusnadi; Al Haddar, Mariyam; Rahmawati, Septyana Eka
Journal of Tropical Animal Science and Technology Vol. 8 No. 1 (2026): Journal of Tropical Animal Science and Technology
Publisher : Animal Husbandry Study Program, Faculty of Agriculture, Timor University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v8i1.9942

Abstract

This research seeks to explore the practical implementation of technical elements regarding beef cattle farming, covering breeding, housing, nutrition, health, and management practices in Seteluk District, West Sumbawa Regency. The investigation took place in Seteluk District, West Sumbawa at the beginning of 2025. The methodology employed for this study was the survey/observation technique involving a sample size of 100 farmers. The study's variables included respondent demographics, breeding practices, housing conditions, feeding practices, health-related factors, and management techniques. The findings indicated that all respondents were male at 100%, with farmers aged between 41 and 60 years, 53.00% having completed high school, breeding experience ranging from 1 to 20 years, and 99.00% primarily working as farmers. The implementation rates of technical aspects in beef cattle farming were as follows: 66.20% for reproduction, 40.80% for housing, 21.20% for feeding, 39.60% for health, and 38.20% for management. In conclusion, this study reveals that the overall technical aspects of cattle rearing in Seteluk Sub-district, West Sumbawa Regency are at a low percentage of 41.20%.
Giblet Organs and Digestive Performance of Native Chickens in the Pullet Phase Fed Diets Supplemented with Propionic Acid Tae, Agustina Viktoria; Naisali, Yuliana; Lisnahan, Charles V.; Pardosi, Lukas
Journal of Tropical Animal Science and Technology Vol. 8 No. 1 (2026): Journal of Tropical Animal Science and Technology
Publisher : Animal Husbandry Study Program, Faculty of Agriculture, Timor University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v8i1.10601

Abstract

The purpose of this study was to examine the effect of propionic acid levels in feed on the performance of giblet organs and digestive tracts of pullet-phase Native chickens. A total of 80 Native chickens aged 12 weeks with an average weight of 400 g were used in this study. The research design applied was a Completely Randomized Design (CRD). Chickens were randomly divided into four treatments with four replications, where each replication consisted of four Native chickens. The treatments given were T0: control feed without propionic acid; T1: control feed + 0.25% propionic acid; T2: control feed + 0.50% propionic acid; T3: control feed + 0.75% propionic acid. Data analysis was conducted using ANOVA, followed by the Duncan Test to determine differences between treatments. The results showed that live weight, giblet weight, pancreas weight, intestine weight, intestine length, proventriculus weight, were highest in the T3 control feed + 0.75% propionic acid treatment, respectively, at 1622.36±38.24 g/head; 59.23±0.39 g/head; 3.54±0.04 g/head; 27.24±0.57 g/head; 27.24±0.57 g/head; 129.33±0.68 cm/head; 6.04±0.18 g/head. The highest giblet percentage and proventriculus percentage were in the T0 control feed treatment without propionic acid at 3.74±0.12%/head and 0.38±0.01%/head, respectively. The highest percentage of pancreas weight was in the T2 treatment of control feed + 0.50% propionic acid and the T3 treatment of control feed + 0.75% propionic acid, which was 0.22 ± 0.01%/head. The highest percentage of intestine weight was obtained in the T2 treatment (control feed + 0.50% propionic acid) with a value of 1.71 ± 0.03%/head. Analysis of variance showed that the treatment significantly affected the live weight, giblet organ weight, pancreas weight, percentage of pancreas weight, small intestine weight, intestine length, and proventriculus weight of pullet phase Native chickens (P <0.05). It can be concluded that the addition of 0.75% propionic acid to the control feed had a positive effect on the performance of the giblet organ and digestive tract of Native chickens.
Agricultural Waste Processing Technologies (Silage and Ammoniation) for Ruminant Feed in Drylands: Literature Review Mafefa, Nitty Cendrabagusti; Banamtuan, Adyanto Nessy
Journal of Tropical Animal Science and Technology Vol. 8 No. 1 (2026): Journal of Tropical Animal Science and Technology
Publisher : Animal Husbandry Study Program, Faculty of Agriculture, Timor University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v8i1.10645

Abstract

Dryland regions commonly experience ruminant feed shortages during the dry season. The year‑round availability of high‑quality feed is a critical prerequisite for sustainable livestock development. Livestock productivity can be improved through the consistent provision of nutritionally adequate feed resources. This opportunity is supported by abundant agricultural production, particularly maize, which has not yet been optimally utilized for livestock feeding. However, most existing feed resources are characterized by low nutritional value and therefore cannot adequately support animal productivity without further processing. Agricultural residues such as rice straw and corn stover are available in large quantities but require technological intervention to improve their feeding value. Processing technologies based on silage and ammoniation have been widely reported to enhance nutrient availability and extend the storage life of these materials. This review synthesizes published research on the potential of agricultural residues as ruminant feed resources in dryland ecosystems and evaluates the effectiveness of silage and ammoniation technologies. The evidence indicates that both technologies substantially improve feed quality, increase feed availability during the dry season, and strengthen farmers’ capacity to utilize local resources in a sustainable livestock production system.
Heritability of Body Weight in Crossbreed Chickens Between Bangkok Chickens and Laying Hens Based on Measurements at 8 Weeks of Age Badaruddin, Rusli; Aka, Rahim; Azulyatno Hadini, Hairil; Hermawan, La Ode
Journal of Tropical Animal Science and Technology Vol. 8 No. 1 (2026): Journal of Tropical Animal Science and Technology
Publisher : Animal Husbandry Study Program, Faculty of Agriculture, Timor University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v8i1.10655

Abstract

This study aims to estimate the heritability of body weight in Bangkok crossbred chickens with laying breeds based on genetic variation components at 1–8 weeks of age. The data were analyzed using CRD (Completed Randomized Design) variance with a nested design (hierarchical structure) to obtain the variance components. The variance components were used to determine the estimated heritability of body weight in chickens resulting from crossbreeding between Bangkok and laying breeds. The results showed that environmental variance dominated in the early weeks, while dominant variance increased sharply in weeks 5 to 7. At week 8, additive genetic variance increased significantly (σ²s = 815,60), resulting in a high total heritability (ĥ²s+d = 0,61). These findings indicate that 8 weeks of age is the optimal point for selecting body weight in crossbred Bangkok chickens with laying breeds.

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