Effects of limited lighting and restricted feeding on the resumption of laying after forced moulting.
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概要
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The experiment was performed to find out the effects of limited light (FL treatment) and restricted feed (FR treatment) on the resumption of egg laying after forced moulting in the chicken. Forced moulting was induced by a 3-day water withdrawal and a 10-day feed withdrawal at 70 weeks of age. In FL treatment lighting was limited to 6 hours per day during forced moulting treatment and started to increase to 16 hours by 1 hour per day on 11th, 21st or 31st day after the beginning of forced moulting treatment. In the control group, the 16-hour lighting was maintained during the experimental period. Feed was given ad libitum throughout the period in all of the groups. In FR treatment feed was restricted to 45g/bird/day for 10, 20 or 30 days after the forced moulting treatment and given ad libitum thereafter. In the control, feed was freely available during the experimental period. Lighting was 16 hours per day in all the groups.The cessation of egg laying was observed within 4 to 7 days after the beginning of the treatments and continued during the period of FL or FR treatmeat. Egg laying began with-in 13 to 24 days by increased lighting hours or ad libitum feeding. Application of a longer period of FL or FR treatment resulted in a rapid resumption of lay.FL and FR treatments seemed havea similar effect on the regulation of egg production. Birds receiving FL or FR treatment for 40 days revealed a relatively high egg production rate after forced moulting.
- 日本家禽学会の論文
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