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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 103 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.

Page 11 of 11 | Total Record : 103

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