Ketelaars E H, Verbrugge M, van der Hel W, van de Linden J M, Verstegen W M
Poult Sci. 1986 Dec;65(12):2208-13. doi: 10.3382/ps.0652208.
The effects of an intermittent light scheme (IL) with cycles of 1 hr light and 3 hr of darkness, vs. 23 hr light and 1 hr darkness or continuous light (CL) on performance and physiological parameters from 1 week until 6 weeks of age were tested in an experiment with 960 broilers in two respiration chambers. The IL group tended to grow faster (2.1 g per bird per day) and to consume more feed (1.6 g per bird per day). The ratio of feed intake to weight gain (feed conversion) however, was consistently lower; in the first 2 weeks of the experiment it was significantly lower. Percentage of abdominal fat of IL birds was 2.93 compared to 2.67% for the CL birds. Incidence of leg abnormalities was 6% in the IL and 11% in the CL group. The tendency to a higher efficiency of the IL group may be explained by a lower heat production (H) in this group in 4 out of 5 experimental weeks. Values of H were 786 kJ per kg.75 per day for the IL group, 817 kJ for the CL group (4.184 kJ/kcal). The calculated energy requirement for maintenance was also lower in the IL group than in the CL group: (458 kJ and 486 kJ per kg.75 per day, respectively.) This difference may be associated with less activity of the IL group compared with the CL group.
在两个呼吸室中对960只肉鸡进行的一项实验中，测试了1小时光照和3小时黑暗循环的间歇光照方案（IL）、23小时光照和1小时黑暗或持续光照（CL）对1周龄至6周龄肉鸡生长性能和生理参数的影响。IL组肉鸡往往生长更快（每只鸡每天增重2.1克）且采食量更多（每只鸡每天多采食1.6克）。然而，采食量与体重增加的比率（饲料转化率）一直较低；在实验的前两周，该比率显著较低。IL组肉鸡腹部脂肪百分比为2.93%，而CL组为2.67%。IL组腿部异常发生率为6%，CL组为11%。IL组效率更高的趋势可能是由于在5个实验周中的4周，该组的产热量（H）较低。IL组的H值为每千克0.75体重每天786千焦，CL组为817千焦（4.184千焦/千卡）。IL组维持所需的计算能量需求也低于CL组：分别为每千克0.75体重每天458千焦和486千焦。这种差异可能与IL组比CL组活动较少有关。
