The purpose of this study was to determine the trends components of 305 day milk yield of Holstein cattle raised at Ankara Sugar Factory Farm were studied. The environmental effect of the phenotypic trend was estimated by using corrected milk records of cows for 2 consecutive years. The environmental change per year was estimated as -177.00 kg year-1. The regressions of the corrected milk yield averages on years for were found to be 72.87 kg year-1. Considering this value, the genetic change was calculated to be 249.87 kg year-1.
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Galip Bakir and Ali Kaygisiz, 2004. Estimates of Trends Components of 305 Days Milk Yield at Holstein Cattle`s. Journal of Biological Sciences, 4: 486-488.