Effect of 25-Hydroxycholecalciferol with Different Vitamin D3 Levels in the Hens Diet in the Rearing Period on Growth Performance, Bone Quality, Egg Production, and Eggshell Quality

A study was conducted to evaluate the effect of 25-hydroxyvitamin D3 (25-OHD) with different levels vitamin (VD3) during rearing period (1–20 weeks) on laying hen performance, bone quality, and eggshell quality. total four hundred 1-day-old Lohman pullets were randomly allotted into a 2 × factorial design dietary VD3 (300 2800 IU/kg) 25-OHD (0 56 μg/kg). Each treatment had five replicates 20 hens each. Increasing level (2800 vs. 300 tended increase body weight uniformity (0.05 < p 0.1) at 8 weeks. Dietary supplementation growing did not improve performance quality (eggshell strength, thickness, relative weight) (p > 0.05). Compared IU/kg group, group showed higher serum calcium concentration keel length 10 weeks The addition significantly increased calcified rate tibia ash phosphorus content weeks, strength 72 0.05), 0.1). Overall, results gathered in this indicate that high improved early later period, but no period.