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All Journal Journal of Tropical Animal Science and Technology Journal of Mathematics Theory and Applications
Alfred Nubatonis
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Agriculture, Biological Sciences & Forestry Computer Science & IT Decision Sciences, Operations Research & Management Education Health Professions Immunology & microbiology

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Analisis Regresi Linear Berganda Pendugaan Bobot Hidup Sapi Bali Jantan Berdasarkan Ukuran Morfometrik Theodorus Banu; Eva Binsasi; Fried Markus Allung Blegur; Alfred Nubatonis
Journal of Mathematics Theory and Applications Vol. 1 No. 1 (2022): Edisi Oktober 2022
Publisher : Program Studi Matematika, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/j-math.v1i1.3834

Abstract

Knowing the live weight of male Bali cattle is very important to increase the selling price. Meanwhile, the limited ownership of animal scales as a measuring device for live weight means that livestock farmers in remote areas do not maximize the selling price according to government regulations. This study aims to determine the factors that influence the live weight of male Bali cattle and to form the best estimator model through its morphometric measurements. A total of 51 male Bali cattle (2 to 3.5 years old) were used in this study. The results of the study were analyzed and mathematically met the requirements for finding factors that affect live weight morphometrically and forming the best estimating model using the linear regression method. The results of the regression analysis showed that chest circumference (X3), body length (X1) and body height (X2) respectively were factors that greatly influenced the live weight (Y=-255.161+1.253X1+2.148X3+0.033) of male Bali cattle with a coefficient of determination 97.8%, 97% and 96%. The best estimator model for male Bali cattle live weight uses 2 estimating variables, namely body length and chest circumference, namely. This model has a very significant effect ( with a coefficient of determination of 97.9%.
Isolation and Identification of Bacteria from Cattle Rumen Fluid and Their Application on In Vitro Digestibility of Rice Straw Gerson Frans Bira; Stefanus Sio; Matius S Batu; Lukas Pardosi; Kristoforus W Kia; Maria Magdalena kolo; Alfred Nubatonis
Journal of Tropical Animal Science and Technology Vol. 7 No. 3 (2025): Journal of Tropical Animal Science and Technology
Publisher : Animal Science Study Program, Faculty of Agriculture, Science and Health, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jtast.v7i3.10038

Abstract

This study aimed to isolate and identify bacteria from the rumen fluid of Bali cattle and to evaluate their effect as microbial inoculants on the in vitro digestibility of rice straw. The experiment was conducted using a Completely Randomized Design (CRD) consisting of four treatments and four replications. The treatments included rice straw silage with the addition of 0%, 5%, 10%, and 15% of local microorganisms (MOL) derived from cattle rumen fluid. The observed variables included the isolation and identification of bacteria from the rumen fluid, and the assessment of in vitro digestibility, including Dry Matter Digestibility (DMD), Organic Matter Digestibility (OMD), Volatile Fatty Acid (VFA) concentration, and ammonia (NH₃) production. The results showed that the addition of rumen fluid MOL significantly (P<0.05) improved the digestibility parameters. The highest DMD (52.44%) and OMD (47.11%) were obtained from the treatment with 15% MOL. VFA and NH₃ concentrations also increased, indicating enhanced microbial activity and fermentation efficiency. The study concludes that MOL derived from cattle rumen fluid, particularly those containing Bacillus sp., is effective in improving the nutritional quality and digestibility of rice straw
Co-Authors Eva Binsasi Gerson Frans Bira Kolo, Maria Magdalena Kristoforus W Kia Lukas Pardosi Matius S Batu Sio Stefanus, Sio Theodorus Banu