Journal article
Effect of dietary 25-hydroxycholecalciferol supplementation and high stocking density on performance, egg quality, and tibia quality in laying hens
J Wang, L Qiu, H Gong, P Celi, L Yan, X Ding, S Bai, Q Zeng, X Mao, S Xu, C Wu, K Zhang
Poultry Science | ELSEVIER | Published : 2020
Abstract
This study was conducted to determine the effects of 25-hydroxycholecalciferol (25-OH-D3) on performance, egg quality, tibia quality, and serum hormones concentration in laying hens reared under high stocking density. A total of 800 45-week-old Lohmann laying hens were randomly allotted into a 2 × 2 factorial design with 2 levels of dietary 25-OH-D3 levels (0 and 69 μg/kg) and 2 rates of stocking densities [506 (low density) and 338 (high density) cm2/hen]. Laying hens were monitored for 16 wk. High stocking density decreased laying rate, egg weight, and feed intake compared with low stocking density (P < 0.01) during 1 to 8 wk and 1 to 16 wk. Overall, high stocking density increased eggshel..
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Awarded by National Natural Science Foundation of China
Funding Acknowledgements
This work was supported by the earmarked grant for the National Key Research and Development Program of China, China (Grant NO. 2017YFD0500503), National Natural Science Foundation of China, China (Grant NO. 31872792, 31402031), and Sichuan Provincial Science and Technology Projects, China (2014BAD13B04, 2014NZ0043, 2014NZ0002, 2013NZ0054) for financial support.