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One hundred and one thyroxine secretion rate determinations were made on 36 Holstein-Friesian heifers from birth to 2 yr of age.The experimental design was baIanted with respect to age of animals and the season of year in which determinations were made.Thyroxine secretion rates were determined by the chemical thyroxine turnover method.The eovariance analysis of the data was on a log-log basis.The formula representing the relationship between the variables on a within-animal basis was ~g = 0.033 X °'s~° for the 50-to 550-kg body weight range, where Y was total daily
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Mixner et al. (1966) studied this question.
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