Liu H K, Long D W, Bacon W L
Department of Animal Sciences, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 44691, USA.
Poult Sci. 2001 Oct;80(10):1509-18. doi: 10.1093/ps/80.10.1509.
Young photosensitive turkey hens of a line selected for increased egg production (Egg line) were photostimulated with constant light [24 h light:0 h darkness] at 30 wk of age. Egg laying became arrested in 6 of 12 the hens after only 2 to 3 wk of laying. Ovarian morphology and changes in concentrations of plasma hormones [luteinizing hormone (LH), progesterone (P4), and estradiol-17beta (E2)] over 10 d of serial bleeding were compared between the arrested laying and normal laying hens. The number of ovarian follicles heavier than 1.0 g was much greater in arrested laying hens, and some of the arrested laying hens presented a polycystic ovarian follicle condition. The oviducts of the arrested laying hens were fully developed and were similar in weight to those of normal laying hens. In arrested laying hens the plasma concentration of LH was relatively low (1.72 +/- 0.30 ng mL(-1)) and without preovulatory surges. In normal laying hens the baseline concentration of LH was 2.60 +/- 0.71 ng mL(-1), and the interval between LH surges was 26.8 h. In the arrested laying hens, the plasma concentration of P4 was relatively high (4.66 +/- 1.28 ng mL(-1)) and without preovulatory surges. In normal laying hens the baseline concentration of P4 between surges was 1.76 +/- 0.24 ng mL(-1). Plasma E2 concentrations were not different between normal laying and arrested laying hens. In conclusion, ovulations and ovipositions ceased in the arrested laying hens, but the entrance of follicles into the follicular hierarchy and hierarchical growth continued, leading to an accumulation of numerous mature follicles in the ovary. In addition, some of the accumulated mature follicles might have resumed growing, leading to the formation of cystic ovarian follicles.
选取了一个为提高产蛋量而选育的品系中的年轻光敏火鸡母鸡（产蛋系），在30周龄时用恒定光照[24小时光照：0小时黑暗]进行光刺激。在产蛋仅2至3周后，12只母鸡中有6只停止产蛋。对停止产蛋的母鸡和正常产蛋的母鸡在连续10天采血期间的卵巢形态以及血浆激素[促黄体生成素（LH）、孕酮（P4）和雌二醇-17β（E2）]浓度变化进行了比较。停止产蛋的母鸡中，重量超过1.0克的卵巢卵泡数量多得多，并且一些停止产蛋的母鸡呈现多囊卵巢卵泡状况。停止产蛋的母鸡的输卵管已充分发育，重量与正常产蛋的母鸡相似。停止产蛋的母鸡血浆中LH浓度相对较低（1.72±0.30纳克/毫升），且无排卵前高峰。正常产蛋的母鸡中，LH的基础浓度为2.60±0.71纳克/毫升，LH高峰之间的间隔为26.8小时。在停止产蛋的母鸡中，P4的血浆浓度相对较高（4.66±1.28纳克/毫升），且无排卵前高峰。正常产蛋的母鸡中，高峰之间P4的基础浓度为1.76±0.24纳克/毫升。正常产蛋和停止产蛋的母鸡之间血浆E2浓度没有差异。总之，停止产蛋的母鸡排卵和产蛋停止，但卵泡进入卵泡等级体系及等级生长仍在继续，导致卵巢中积累大量成熟卵泡。此外，一些积累的成熟卵泡可能已恢复生长，导致形成囊性卵巢卵泡。
