Modeling extended lactations of Holsteins.


Modeling extended lactations for the US Holsteins is useful because a majority (>55%) of the cows in the present population produce lactations longer than 305 d. In this study, 9 empirical and mechanistic models were compared for their suitability for modeling 305-d and 999-d lactations of US Holsteins. A pooled data set of 4,266,597 test-day yields from… (More)


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@article{Dematawewa2007ModelingEL, title={Modeling extended lactations of Holsteins.}, author={C M B Dematawewa and Ronald Edward Pearson and P M Vanraden}, journal={Journal of dairy science}, year={2007}, volume={90 8}, pages={3924-36} }