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Influence of Dietary Calcium, Phosphorus and Vitamin D₃ on Ca⁴⁵, P³² and Sr⁸⁵ Uptake by Chicks¹

University of Tennessee-Atomic Energy Commission Agricultural Research Laboratory, Oak Ridge, Tennessee

Fifteen groups of 15 New Hampshire cockerel day-old chicks were fed ad libitum, diets containing varying levels of calcium (0.5 to 2.5%), phosphorus (0.3 to 1.5%) and vitamin D₃ (10 to 100,000 I.C.U. per pound). The experimental design was a three dimensional central composite type. Three weeks later, Ca⁴⁵, P³² and Sr⁸⁵ were administered orally to 10 birds from each group and intraperitoneally to the remaining 5. All birds were sacrificed 48 hours after dosing and tibiae removed for radioisotope assay. A significant interaction, Ca x P was observed on growth rate emphasizing the importance of the Ca:P ratio. As the level of dietary vitamin D₃ increased, deposition in tibiae of orally administered Ca⁴⁵ and Sr⁸⁵ increased but that of intraperitoneally administered Ca⁴⁵ and Sr⁸⁵ decreased. Deposition in tibiae of intraperitoneally administered P³² was reduced at the highest level of vitamin D₃ feeding. As the level of dietary calcium increased, deposition of orally administered Sr⁸⁵ and Ca⁴⁵ decreased and that of intraperitoneally administered P³² increased. As dietary phosphorus increased, deposition of orally administered Sr⁸⁵ and P³² and intraperitoneally administered P³² decreased.

Manuscript received 14 October 1960.