Dailey R A, Fogwell R L, Thayne W V
J Anim Sci. 1982 Jun;54(6):1196-20. doi: 10.2527/jas1982.5461196x.
Two studies were conducted to determine the distribution of follicles on the ovarian surface in ewes. In Exp. 1, the effect of the corpus luteum on the distribution of follicles was investigated on d 9, 12 and 14 postestrus in unilaterally ovulating ewes. Follicles (greater than or equal to 2 mm diameter) were inventoried by size and distance from the center of the corpus luteum or corpus albicans. There were more small follicles (less than or equal to 4 mm diameter) on d 9 than on d 12 and 14, Although the ovary bearing the corpus luteum had a greater number of large follicles, no positive relationship of the corpus luteum to the diameter of the closest follicle or the distance of the largest follicle was found. In Exp. 2, follicles were inventoried on ovaries from ewes during the estrous cycle, postpartum anestrus, seasonal anestrus and the peripuberal period. During the estrous cycle, two apparent waves of follicular growth were noted. In addition, during the luteal phase the luteal ovary consistently had a larger follicle than the nonluteal ovary. When estimates were made of the effects of size of follicle on distance of the follicle from the reference structure and of distance on size of follicle, presence of luteal tissue, and day of estrous cycle were found to influence the variances. In addition the interaction of these characteristics affected the variation of size or distance. Weighting the distribution of ovarian structures for relative ovarian mass allowed an examination of localization of structures to standardized ovarian areas. More follicles and corpora lutea were found in the middle of the ovary than on the ends. Although the numbers of follicles in a standardized area were correlated with ovarian mass, occurrence of corpora lutea in a standardized area was not significantly correlated with ovarian mass. Collectively, these results are indicative of a local effect by the corpus luteum on the diameter of the largest follicle and a systemic effect on the number of follicles. In addition, because specific regions appear to be more favorable for follicular activity and ovulation, a precise local effect of the corpus luteum is difficult to determine.
进行了两项研究以确定母羊卵巢表面卵泡的分布情况。在实验1中，对单侧排卵的母羊在发情期后第9、12和14天研究了黄体对卵泡分布的影响。按大小和距黄体或白体中心的距离对卵泡（直径大于或等于2毫米）进行清点。与第12天和14天相比，第9天的小卵泡（直径小于或等于4毫米）更多。虽然有黄体的卵巢有更多的大卵泡，但未发现黄体与最接近卵泡的直径或最大卵泡的距离之间存在正相关关系。在实验2中，对处于发情周期、产后乏情期、季节性乏情期和青春期前后的母羊卵巢上的卵泡进行清点。在发情周期中，观察到明显的两个卵泡生长波。此外，在黄体期，有黄体的卵巢始终比无黄体的卵巢有更大的卵泡。当对卵泡大小对卵泡距参考结构的距离以及距离对卵泡大小的影响进行估计时，发现黄体组织的存在和发情周期的天数会影响方差。此外，这些特征的相互作用影响了大小或距离的变化。根据相对卵巢质量对卵巢结构的分布进行加权，从而可以检查结构在标准化卵巢区域的定位情况。在卵巢中部发现的卵泡和黄体比两端更多。虽然标准化区域内的卵泡数量与卵巢质量相关，但标准化区域内黄体的出现与卵巢质量无显著相关性。总体而言，这些结果表明黄体对最大卵泡直径有局部影响，对卵泡数量有全身影响。此外，由于特定区域似乎对卵泡活动和排卵更有利，因此难以确定黄体的确切局部影响。
