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Six different least-squares analyses were carried out on 280 records from first through fourth completed lactations on milk yield and the percentages, respectively, of total solids, fat, nonfat-solids (NFS), protein, and pregnancy NFS. These records were from 121 Holstein cows in one herd. Two-factor interactions between laction nmnber, gestation length, and season of calving also were considered.
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Parkhie et al. (1966) studied this question.
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