oa Journal of Applied Science in Southern Africa - Genetic and phenotypic parameters for milk protein yields in Holstein cattle
|Article Title||Genetic and phenotypic parameters for milk protein yields in Holstein cattle|
|© Publisher:||University of Zimbabwe|
|Journal||Journal of Applied Science in Southern Africa|
|Affiliations||1 Department of Animal Science, University of Zimbabwe, Harare, Zimbabwe.|
|Publication Date||Jan 2002|
|Pages||1 - 10|
|Keyword(s)||Genetic, Holstein cattle, Milk protein yields and Phenotypic parameters|
Knowledge of genetic parameters is of paramount importance in designing sound breeding programmes. Genetic and phenotypic parameters are needed in the estimation of breeding values. The objectives of this study were to: estimate genetic parameters for milk, fat and protein yields; determine genetic and phenotypic correlations among these production traits and determine if genetic parameters are the same within lactations in Holstein cattle. A total of 17 598 Holstein 305 day milk records from the Zimbabwe Dairy Services Association were used to estimate heritabilities, variances, covariances and genetic and phenotypic correlations among 305 day yields of milk, fat and protein.
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