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Effect of dietary levels of calcium and phosphorus on growth and bone formation of female broiler chicks



Effect of dietary levels of calcium and phosphorus on growth and bone formation of female broiler chicks



Japanese Poultry Science 25(5): 305-311



Seven experimental diets containing various levels of calcium (Ca) and phosphorus (P), prepared by adding Ca carbonate and phosphoric acid to a basal diet containing 0.2% of Ca and 0.4% of P, were fed to female broiler chicks of 3-week-old for 4 weeks. Body weight gain and feed conversion (feed/gain) of the chicks fed a diet containing 1.2% of Ca and 0.9% of P (abbreviated as Diet 1.2-0.9) were the best. Their tibia was the heaviest, longest, widest, and strongest among the tibiae of the chicks fed the other diets. The typical histological change of the epiphyseal cartilage of the tibia of the chicks fed the diets containing excess Ca, in other words P deficiency, was enlargement of the hypertophic zone. The typical histological change of the epiphyseal cartilage fed the diets containing excess P, in other words Ca deficiency, was enlargement of the proliferating zone. The tibiae of the chicks fed the diets deficient in Ca, regardless of dietary P level, were felt soft, when the bones were sawed in preparation of specimens for histological examination. The findings were similar to the responses of male chicks fed the diets of the same composition in the previous experiment, but the responses of the females were much weaker than those of the males. Content of available P in the Diet 1.2-0.9 was expected to be 0.5%. The combination of 1.2% of Ca and 0.5% of available P was suspected to be the best one for the growth and the bone formation of broiler of 3 weeks of age or older.

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