Abstract
Summary Twenty-eight pairs of cows were carefully selected from two herds on the basis of previous lactation, age, and time of expected parturition. One of each pair was fed 10 g of thyroprotein daily from 30 days before expected calving until the day after calving, for the purpose of stimulating initial lactation levels. Other treatment and feeding were alike within pairs from 30 days prepartum to 15 wk of lactation. The treated cows averaged 5,101 lb FCM in 15 wk compared to 5,033 lb for the controls, a nonsignificant difference. Thyroprotein feeding reduced the rate of gain significantly in the prepartum period, but did not appear to affect any post-partum responses or the general health of the cows.
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