Blake A G, Ringer R K
Poult Sci. 1987 Feb;66(2):231-6. doi: 10.3382/ps.0660231.
A total of 108 pheasant hens was exposed to either a conventional 24-hr (14L:10D), an ahemeral 22-hr (14L:8D), or an ahemeral 26-hr (14L:12D) light-dark (L:D) cycle. Total lag time for each egg sequence was greater in the ahemeral cycles than in the conventional L:D cycle, resulting in significant (P less than .05) differences in egg formation times (EFT) or intraclutch intervals of 26.4, 25.8, and 27.5 hr, respectively. The EFT under the ahemeral 26-hr L:D cycle was synchronized (within 1.5 hr) with the length of the L:D cycle. This light cycle resulted in the longest egg sequences (average 8.5 eggs per sequence) produced under any of the three L:D cycle treatments due to a shorter pause in oviposition. Values were significantly (P less than .05) different from the average values obtained under the conventional 24 hr L:D cycle (4.9 egg per sequence) and ahemeral 22 hr L:D cycle (3.5 eggs per sequence).
总共108只雌雉鸡被暴露于常规的24小时（14小时光照：10小时黑暗）、无昼夜节律的22小时（14小时光照：8小时黑暗）或无昼夜节律的26小时（14小时光照：12小时黑暗）的明暗（L:D）循环中。在无昼夜节律的循环中，每个蛋序列的总滞后时间比在常规的L:D循环中更长，导致产蛋形成时间（EFT）或窝内间隔分别有显著（P小于0.05）差异，分别为26.4、25.8和27.5小时。在无昼夜节律的26小时L:D循环下的EFT与L:D循环的时长同步（在1.5小时内）。由于产卵暂停时间较短，这种光照循环导致在三种L:D循环处理中的任何一种下产生的蛋序列最长（平均每个序列8.5个蛋）。这些值与在常规的24小时L:D循环（每个序列4.9个蛋）和无昼夜节律的22小时L:D循环（每个序列3.5个蛋）下获得的平均值有显著（P小于0.05）差异。
