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Twenty-seven calves obtained at birth were fed colostrum at 2.5% of body weight immediately and at 12 hours after birth, and at 3.75% of weight at 24 and 36 hours. Blood samples were taken at 3, 12, 24, 48, 96, and 168 hours after birth. Colostrum samples taken at parturition and at 12 and 24 hours were available from 19 cows.
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Bush et al. (1971) studied this question.
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