Bacon W L, Liu H K
Department of Animal Sciences, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster Ohio 44691, USA.
Poult Sci. 2003 Dec;82(12):1985-9. doi: 10.1093/ps/82.12.1985.
An arrest in egg laying associated with a polycystic ovarian follicle syndrome (PCOF) has been recently reported early in the egg production period in turkey hens photostimulated at 30 wk of age (WOA) with continuous light. When autopsied 2 to 3 wk after laying ceased, the ovaries of PCOF hens contained an increased number of mature size (F1) yolky follicles in comparison with normally laying hens plus several larger cystic follicles, while their oviducts were equal in weight to oviducts of hens laying normally. Four experiments were conducted to examine effects of age at photostimulation and photoperiod [14L:10D (14L) or continuous lighting 24L:0D (24L)] on the incidence of the PCOF syndrome. Turkey hens of the egg line were given short-day photostimulation of 6L:18D at 16 WOA and then photostimulated with either 14L or 24L at various ages between 26 to 70 WOA. Egg production was followed for 6 to 8 wk, and hens that stopped laying eggs during this period were autopsied 2 to 3 wk later to determine presence and incidence of the PCOF syndrome. At 26 WOA, the PCOF incidence was 80% with 24L lighting and 31% with 14L lighting (P = 0.006). At 28 WOA, the PCOF incidence was 56% with 24L lighting and 25% with 14L lighting (P = 0.072). At 31, 34, and 41 WOA, there were no differences (P > or = 0.10) in incidence of the PCOF syndrome between the 24L and 14L treatments. Within the 24L treatment, the PCOF incidence at 26 and 28 WOA (80 and 56%) were greater than at 31 WOA and older ages (< or = 20%; P < or = 0.025). Within the 14L lighting treatment, the PCOF incidence was not different among ages (26 WOA, 31% to 48 WOA, 0%; P > or = 0.05). It was concluded that the incidence of the PCOF syndrome is greater when photosensitive Egg line turkey hens are photostimulated at relatively young ages (less than 31WOA) and with 24L in comparison to 14L lighting.
最近有报道称，在30周龄（WOA）接受连续光照光刺激的火鸡母鸡产蛋初期，出现了与多囊卵巢卵泡综合征（PCOF）相关的产蛋停止现象。在产蛋停止后2至3周进行尸检时，与正常产蛋母鸡相比，PCOF母鸡的卵巢中成熟大小（F1）的有卵黄卵泡数量增加，还有几个更大的囊性卵泡，而它们的输卵管重量与正常产蛋母鸡的输卵管相等。进行了四项实验，以研究光刺激时的年龄和光照周期[14小时光照：10小时黑暗（14L）或连续光照24小时光照：0小时黑暗（24L）]对PCOF综合征发病率的影响。蛋用系火鸡母鸡在16周龄时接受6小时光照：18小时黑暗的短日照光刺激，然后在26至70周龄之间的不同年龄用14L或24L进行光刺激。记录产蛋6至8周，在此期间停止产蛋的母鸡在2至3周后进行尸检，以确定PCOF综合征的存在和发病率。在26周龄时，24L光照下PCOF发病率为80%，14L光照下为31%（P = 0.006）。在28周龄时，24L光照下PCOF发病率为56%，14L光照下为25%（P = 0.072）。在31、34和41周龄时，24L和14L处理之间PCOF综合征的发病率没有差异（P≥0.10）。在24L处理中，26和28周龄时的PCOF发病率（80%和56%）高于31周龄及更大年龄（≤20%；P≤0.025）。在14L光照处理中，各年龄之间的PCOF发病率没有差异（26周龄，31%至48周龄，0%；P≥0.05）。得出的结论是，与14L光照相比，当对感光蛋用系火鸡母鸡在相对年轻的年龄（小于31周龄）且用24L进行光刺激时，PCOF综合征的发病率更高。
