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  • Title: The effect of low levels of dietary protein and calcium on growth rate, growth hormone, and vitamin D metabolism in the chick.
    Author: Sommerville BA, Harvey S.
    Journal: Gen Comp Endocrinol; 1988 Jul; 71(1):93-6. PubMed ID: 3261703.
    Abstract:
    Two experiments were carried out on 2-week-old chicks in which they were fed protein-deficient diets for varying lengths of time with or without calcium (Ca). All deficient diets depressed the rate of growth; this depression was more marked in chicks fed the protein-deficient diet for 21/2 days than in those fed the diet for 4 days. The circulating growth hormone level was high in all protein-deficient diets but low in the diet only deficient in calcium. The low Ca-induced-rise in renal vitamin D, 1-hydroxylase activity was reduced, and the plasma Ca level was particularly low, in chicks on the low protein/low Ca diet. The 24-hydroxylase activity was high on the low protein diets. It was concluded that adaptation to a low protein diet occurs over the first 4 days and that this may be associated with the high growth hormone level and also that adequate dietary protein is essential for maximal adaptation to dietary Ca deficiency.
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