Performance and bone quality of modern broiler chicks as influenced by hens' age and egg storage time
Shim, Mi Yeon
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The Hens’ age has been shown to influence bone quality, especially TD. Egg storage time has been shown to influence chick quality. Four experiments were conducted with chicks hatched from eggs laid by Ross × Ross 308 hens to investigate the influence of hens’ age and egg storage time (0 vs. 10 d) on egg parameters, chick growth and bone abnormalities in progeny as influenced by diets formulated to induce tibial dyschondroplasia (TD) or rickets. The diets were based on corn, soybean meal and soybean oil. The TD-inducing diet contained 0.60 % Ca and 0.50 % available P and the Phosphorous (P) rickets-inducing diet contained 1.00 % Ca and 0.25 % available P. The hens’ age had significant effects on 0 - 16 d chick growth and the score and incidence of TD. The egg storage time had significant effects on the score and incidence of P rickets. The 1 .-OH cholecalciferol (vitamin D3) had significant effects on the score and incidence of P rickts and chick mortality (%) for 16 d.