Genetic and Environmental Factors Associated with Milk Yield in Beef Cattle PDF Download

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Genetic and Environmental Factors Associated with Milk Yield in Beef Cattle

Genetic and Environmental Factors Associated with Milk Yield in Beef Cattle PDF Author: James Ronald Dickey
Publisher:
ISBN:
Category : Milk
Languages : en
Pages : 186

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Book Description
The objectives of this study were to estimate environmental effects on milk yield of beef cows, to estimate genetic parameters associated with milk yield and cow growth traits and to estimate the direct effects of average lifetime milk yield on all traits studied. Milk yield data (the mean of three within lactation observations obtained by the calf-nursing method after an average l6-hr separation) were recorded in 1969 and 1970 for 262 and 201 lactations, respectively, of 162 Angus cows by 46 sires and 137 Hereford cows by 39 sires. The data were analyzed by the least-squares method to estimate environmental effects within each breed. The Angus data were adjusted for the effect of cow age (P