Pendugaan Nilai Nilai Pemuliaan Sifat Produksi Susu pada Pejantan Sapi Friesian Holstein Di BBPTU Sapi Perah Baturraden Purwokerto.

Abstract

A bull can not produce milk, therefore it was necessary to estimate its milk genetic ability. Progent test can be done to evaluate milk transmitting ability of bulls on the base of milk yields of their daughters. Contemporary Comparison (CC) method is one method that can be used to estimate breeding values of sires in the progeny test. This research was aimed to estimate breeding values of milk transmitting ability of Holstein Friesian (HF) Sires based on the progeny test in BBPTU-SP Baturraden, Purwokerto. A total number of 176 records of first (1st) lactation milk yields from the daughthers of 83 sires were collected in during a period of 2005-2010. Data of milk yield per lactation was calculated by summing daily milk yield during a certain lactation period. Those that were standardized to 305 days of lactation and to mature eqivalent by Dairy Herd Improvement Association-United State Department of America (DHIA-USDA) in order to estimate heritability (h2) and breeding values of milk yield. Heritability value was estimated by paternal half sib correlation method, while breeding values of sires were estimated by the CC method. The average of 1st lactation milk yields was 3.922 kg/lactation. The averages of th 1st milk yields by the years from 2006 to 2011 were succesively 4,595, 3,765, 3,760, 2,928, 3,266, and 2.527 kg/lactation. The h2 value for the 1st lactation milk yields was 0.30±0.40. The results of estimating breeding values of milk of sires showed that from the 83 heads of sires evaluated resulted positive breeding values by 97,59% and negative breeding values by 2,41%. By considering the sires at the best 5% ranks were those with the breeding values of 164.24-219.86.