Two methods were used to investigate the caloric equivalent of live weight loss during undernutrition of first-lactation Holstein heifers. In one case estimates were made fron} a comparative slaughter trial and in the other from a carbon-nitrogen balance trial. Feed intakes were restricted by using rations calculated to provide 65% of the minimum TDN requirements of the heifers.
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Bath et al. (1965) studied this question.
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