Effects of delayed feeding on the performance of laying hens rraised under thermoneutral and high ambient temperature conditions
2019
Kohrogi, R. (Kagoshima University, Kagoshima (Japan). Department of Biochemical Science and Technology) | Nishikoba, N. | Shimamoto, S. | Kamimura, R. | Nakashima, K. | Tada, O. | Ohtsuka, A. | Ijiri, D.
The aim of this study was to evaluate the effects of delayed feeding for 2 days post hatching period on the performance of laying hens raised under thermoneutral (25 ± 1℃) or practical high ambient temperature (35 ± 1℃ for 8 h per day) conditions. Twenty newly 0-day-old chicks (Lohman) were randomly divided into 2 groups (control and delayed feeding group). The control group of chicks was fed ad libitum from 0 day of age, while the delayed feeding group of chicks was fed ad libitum from 2 days of age after fasting for 2 days post hatching. At 161 days of age, the laying performance of the control and delayed feeding group were examined for 7 days, and then these 2 groups of the laying hens were additionally divided into two groups, respectively (thermo-neutral and heat ambient temperature). Both the delayed feeding and the heat ambient temperature significantly decreased eggshell weight, while they did not affect egg weight, egg-laying rate, and feed conversion ratio. In addition, the delayed feeding significantly decreased plasma 25-Hydroxyvitamin D3 concentration, while the heat ambient temperature did not affect it. These results suggest that delayed feeding for 2 days post hatching period decreased eggshell weight accompanied by decreased plasma 25-Hydroxyvitamin D3 concentration in laying hens.
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