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1 α -Hydroxycholecalciferol (1 α -OH-D 3 ) is an active vitamin D derivative. In this study, three experiments were conducted to evaluate the optimal dietary levels of 1 α -OH-D 3 in broiler chickens from 1 to 42 days of age. 1 α -OH-D 3 levels used were 0, 1.25, 2.5, 5, and 10 µ g/kg in experiment 1, 0.625, 1.25, 2.5, 5, 7.5, and 10 µ g/kg in experiment 2, and 2, 2.5, 3, 3.5, 4, 4.5, and 5 µ g/kg in experiment 3. In experiment 1, the addition of 0 to 10 µ g/kg of 1 α -OH-D 3 quadratically improved growth performance, tibia development, and mRNA expression levels of nuclear vitamin D receptor (nVDR), membrane vitamin D receptor (mVDR), and type IIb sodium-phosphate cotransporter (NaPi-IIb) in the duodenum of broiler chickens from 1 to 12 days of age. Body weight gain (BWG), the weight and ash weight of the tibia, and mRNA expression levels of mVDR and NaPi-IIb of broilers fed with 0 and 10 µ g/kg of 1 α -OH-D 3 were lower than those of birds fed with 2.5 µ g/kg of 1 α -OH-D 3 . In experiment 2, 1 α -OH-D 3 levels were quadratically related to BWG and to weight and ash weight of the femur and the tibia of broiler chickens at 42 days of age. The highest values of growth performance and bone mineralization were recorded in broilers fed with 2.5 to 5 µ g/kg of 1 α -OH-D 3 . In experiment 3, there was no difference observed in BWG and the weight and ash weight of the femur and the tibia of the 42-day-old broilers fed with 2 to 5 µ g/kg of 1 α -OH-D 3 . These data suggest that the optimal dietary levels of 1 α -OH-D 3 were 2 to 5 µ g/kg for broiler chickens from 1 to 42 days of age.

Optimal Dietary Levels of 1<i>α</i>-Hydroxycholecalciferol in Broiler Chickens from 1 to 42 Days of Age