At the end of 19 (-+ 2.65) wk postpartum, 24 multiparous cows were assigned randomly (6 per group) to rations containing 12, 14, 16, and 18% crude protein for a 6-wk experimental period. Prior to the experimental period all cows were fed a 16% protein diet.
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Barney et al. (1981) studied this question.
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