Genetic Improvement of Weaning Weight, Yearling Weight, Body Weight Gain and Body Dimension of Bali Cattle

Abstract

ABSTRAKTujuan penelitian ini adalah untuk mengevaluasi peningkatan genetik sifat-sifat produksi pada sapi Bali. Sebanyak 428 data bobot sapih, bobot setahun dan pertambahan bobot badan digunakan untuk menduga peningkatan genetik sifat-sifat tersebut. Seratus tujuh data ukuran tubuh (bobot badan, lingkar dada, panjang badan dan tinggi gumba) pada umur 24 bulan juga digunakan untuk menduga peningkatan genetiknya. Pendugaan komponen ragam dan peragam genetik, dan heritabilitas diperoleh dengan menggunakan animal model. Pengaruh tetap untuk bobot sapih, bobot setahun dan pertambahan bobot badan adalah curah hujan, umur pengukuran dan tahun kelahiran, sementara pengaruh tetap untuk ukuran-ukuran tubuh tergantung dari masing-masing karakter. Hasil penelitian menunjukkan bahwa heritabilitas bobot sapih, bobot setahun, pertambahan bobot badan, bobot badan, lingkar dada, panjang badan dan tinggi gumba berturut-turut adalah 0,09±0,15; 0,27±0,13; 0,47±0,15; 0,07±0,19; 0,50±0,19; 0,34±0,28 dan 0,60±0,21. Peningkatan genetik untuk semua karakter mempunyai pola yang berbeda dalam merespon seleksi. Semua karakter tidak menunjukkan peningkatan genetik akibat seleksi.Kata kunci: Sapi Bali, peningkatan genetik, seleksi, karakter produksi ABSTRACTThe aim of the research was to evaluate the genetic improving of production traits selected of Bali cattle. Four hundred and twenty eight data of weaning weight, yearling weight and body weight gain were used to estimate genetic improvement for those traits. One hundred and seven data of body dimension (body weight, chest circumference, body length and withers height) at 24 months old were used to estimate genetic improving for those traits. The estimation of genetic and environmental variance and co-variance component, and heritability were found by animal model. The fix effect of weaning weight, yearling weight and body weight gain was rainfall, age of measurement and year of birth, whereas the fix effect of body dimension depend on each trait. The result showed that heritability of weaning weight, yearling weight, body weight gain, body weight, chest circumference, body length and withers height was 0.090.15, 0.270.13, 0.470.15, 0.070.19, 0.500.19, 0.340.28, 0.600.21, respectively. Genetic improvement of all traits have had a different pattern in selection responses. All traits did not show genetic improvement due to selection for.

Selection of Bali Cattle as a Bull in Nusa Penida Island-Bali Based on Its Performance and Breeding Value

“…Performance is measured by calculating the average chest girth with the formula: , where = mean; = the total value and n is the number of livestock measured Estimation of breeding value is calculated using individual selection methods (performance test) with the formula where NP = the breeding value; h 2 = heritability; = individual chest girth and = population average of chest girth. Heritability value of chest girth used in this calculation refers to the results of research by Supriyantono, et al that is equal to 0.50 [6]. Estimation of breeding value is calculated after selecting as many as 5% of the total male at each age.…”

“…Estimation of breeding value is calculated after selecting as many as 5% of the total male at each age. Then, male were ranked based on the calculation of the average chest girth and estimation of breeding values [6].…”