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The sites of calcium and phosphate absorption in the chick.

Abstract The nutrition of calcium and phosphorus in the chick has been the subject of numerous investigations. However, the intestinal sites of absorption of those minerals have remained unknown, although some information on the absorption capacity of the various intestinal segments exist from in vitro and in situ experimentation (Hurwitz et al., 1967). Previous work indicated that little absorption of calcium and phosphate in the laying hen occurred beyond the jejunum (Hurwitz and Bar, 1965). Since the laying hen is rather peculiar with regard to its mineral metabolism, it was of interest to determine if those findings were also qualitatively the same in the chick. Yttrium-91 was used as a reference substance in all-vegetable diets containing 1.08% calcium and 0.77% phosphorus, supplied mostly by 0.9% calcium carbonate and 2.0% dicalcium phosphate. The diet was labeled with about 60μc./kg. of yttrium-91. Thirty-six Cornish × White Rock males, three weeks old, were fed…