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One method of effecting economies in production testing of dairy cattle involves increasing the interval between tests. Several studies have been published concerning the amount and importance of the accuracy lost when this interval is lengthened. At least seven investigators have reported the accuracy of lactation records computed from monthly butterfat tests and milk weights as compared with an accuracy from daily measures Their results indicate an average deviation of the monthly records from the daily records of about -+-2 per cent for milk yield and 3 per cent for fat yield.
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Bayley et al. (1952) studied this question.
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