Comparison of bioavailability of 1alpha-hydroxycholecalciferol and cholecalciferol in broiler chicken diets
2016
Wang, J. ((Henan Agricultural University (China). College of Animal Husbandry and Veterinary Science), (Shangqiu Normal University (China). College of Life Science, Department of Animal Science)) | Han, J. | Chen, G. | Qu, H. | Wang, Z. | Yan, Y. | Cheng, Y.
The present study aims to compare the relative bioavailability (RBV) of 1alpha-hydroxycholecalciferol (1alpha-OH-Dsub(3)) to cholecalciferol (Dsub(3)) in 1- to 21-d-old broiler chicks fed with calcium (Ca)- and phosphorus (P)-deficient diets. A total of 400 male of 1-d-old Ross 308 broilers were randomly assigned to 8 treatments with 5 replicates each. Five levels of Dsub(3) (0, 2.5, 5, 10, and 20 micro g/kg) and three levels of 1alpha-OH-Dsub(3) (1.25, 2.5, and 5 micro g/kg) were added to a basal diet. The basal diet contained 0.50% Ca and 0.25% non-phytate phosphorus (NPP), without Dsub(3). The RBV of 1alpha-OH-Dsub(3) to Dsub(3) was determined by the slope ratio method. Using body weight gain, feed intake, feed efficiency, and plasma Ca as criteria, the RBV of 1alpha-OH-Dsub(3) to Dsub(3) were 4.78, 4.75, 4.50, and 4.21, respectively. Using tibia breaking-strength, weight, length, width, ash weight and content, and Ca and P content as criteria, the RBV of 1alpha-OH-Dsub(3) to Dsub(3) were 5.58, 5.16, 4.42, 4.70, 5.03, 4.46, 4.70, and 4.79. Using femur weight, length, width, ash weight and content, and Ca and P content as criteria, the RBV of 1alpha-OH-Dsub(3) to Dsub(3) were 5.09, 4.43, 3.19, 5.83, 5.21, 5.27, and 5.31. Using metatarsus weight, length, width, ash weight and content, and Ca and P content as criteria, the RBV of 1alpha-OH-Dsub(3) to Dsub(3) were 5.00, 4.05, 5.94, 4.73, 5.33, 5.64, and 4.28. These data indicate that the RBV of 1alpha-OH-Dsub(3) to Dsub(3) is 4.84 in promoting growth performance and bone mineralization in broilers from 1 to 21 d of age.
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