Longitudinal analysis estimates environmental and management variations across lactations in dairy cattle, highlighting external drivers of herd productivity.
Enviromnental studies for 230 cows over 462 lactations were made for 7 yr. Statistical estimates of general environmental changes and the specific changes resulting from the influences of feeding and management factors were computed and compared. These estimates were based on 462 lactations of 230 cows made over a 7-yr. period in the Beltsville Holstein herd.
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McDaniel et al. (1961) studied this question.
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