Most people associated with dairying realize there is a certain amount of daily variation in yields of dairy coves. The magnitude of these variations depends on management procedures Individual cows vary in ease and completeness of milking (6, 1:1, :12, 13, :19, 20). These many factors influence the accuracy of lactation records and thus, indirectly, the reliability of the results for which these records are used.
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Erb et al. (1952) studied this question.
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