Siopes T D
Department of Poultry Science, North Carolina State University, Raleigh 27695-7608.
Poult Sci. 1989 Oct;68(10):1337-41. doi: 10.3382/ps.0681337.
A 3 x 3 factorial experimental design was used to examine the relationship between the duration of short daylength (10, 8, or 4 h light/day) during prelay light restriction and the length of time (12, 8, or 6 wk) that young turkey hens were exposed to light restriction and subsequent photoinduced reproductive performance. Data were collected for time to first egg, egg production, percentage of fertility, and hatchability, and poult weight. Light restrictions consisting of 10, 8, or 4 h light/day were equally effective in terminating photorefractoriness and preparing hens for subsequent photoinduced reproductive performance. A 6-wk exposure to light restriction did not prepare hens for egg laying as effectively as 8 (P less than .05) or 12 (P less than .10) wk of exposure, both of which were similarly effective. A lack of interaction between the light restriction daylength and exposure time suggests that the requirements for effective light restriction are rather specific and cannot be beneficially manipulated by various combinations of daylength and weeks of exposure.
采用3×3析因实验设计，研究产蛋前光照限制期间短日照时长（10、8或4小时光照/天）与雏火鸡母鸡接受光照限制的时长（12、8或6周）以及随后光诱导繁殖性能之间的关系。收集了初产时间、产蛋量、受精率、孵化率和雏禽体重的数据。每天10、8或4小时光照的光照限制在终止光不应性以及使母鸡为随后的光诱导繁殖性能做好准备方面同样有效。6周的光照限制不如8周（P＜0.05）或12周（P＜0.10）的光照限制能有效地使母鸡为产蛋做好准备，而8周和12周的光照限制效果相似。光照限制日长和暴露时间之间缺乏交互作用，这表明有效光照限制的要求相当具体，不能通过日长和暴露周数的各种组合进行有益的调整。
