The effects of dietary cholecalciferol and 1α-hydroxycholecalciferol levels in a calcium- and phosphorus-deficient diet on growth performance and tibia quality of growing broilers
Journal Title: Journal of Animal and Feed Sciences - Year 2013, Vol 22, Issue 2
Abstract
This study aims to evaluate the effects of cholecalciferol (vitamin D3, 0, 5, 10, 25, 50, 100, 250, 500, and 1000 mg · kg–1) and 1α-hydroxycholecalciferol (1a-OH D3, 0, 2.5, and 5 mg · kg–1) on growth performance and tibia quality and to compare the relative potency of 1α-OH D3 to vitamin D3 in 1- to 21-day-old female broilers fed a calcium (Ca)- and phosphorus (P)-deficient diet. The basal diet contained 0.50% Ca, 0.25% non-phytate phosphorus (NPP) and was not supplemented with vitamin D3, whereas the control diet contained 1.00% Ca, 0.45% NPP, and 25 mg · kg–1 vitamin D3. Dietary vitamin D3 levels significantly affected body weight gain (BWG), feed intake (FI), serum Ca and tibia parameters. The addition of 5 mg · kg–1 1α-OH D3 resulted in greater BWG, FI, and serum Ca as well as tibia ash weight and content, breaking strength, and Ca and P contents, compared with the birds fed the basal diet. Using BWG, serum Ca, tibia ash weight and content, and tibia Ca and P content as the criteria, the vitamin D3 requirements of 1- to 21-day-old broilers fed Ca- and P-deficient diets were 64.0, 16.2, 173.0, 65.1, 33.1 and 30.0 mg · kg–1, and the relative potencies of 1α-OH D3 to vitamin D3 were 5.03, 2.19, 18.00, 5.14, 4.09 and 3.33, respectively. These data indicate that high levels of vitamin D3 can spare the use of P in broiler diets and that the potency of 1α-OH D3 is higher than that of vitamin D3
Authors and Affiliations
J. C. Han, H. X. Qu, J. Q. Wang, J. H. Yao, C. M. Zhang, G. L. Yang, Y. H. Cheng, X. S. Dong
Keywords
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