Ishak G M, Bashir S T, Gastal M O, Gastal E L
Department of Animal Science, Food and Nutrition, Southern Illinois University, Carbondale, IL, USA; College of Veterinary Medicine, University of Baghdad, Baghdad, Iraq.
Department of Animal Science, Food and Nutrition, Southern Illinois University, Carbondale, IL, USA.
Anim Reprod Sci. 2017 Dec;187:1-12. doi: 10.1016/j.anireprosci.2017.09.003. Epub 2017 Sep 8.
Color Doppler ultrasonography was used to study the temporal relationships between pre-ovulatory follicle (POF) and corpus luteum (CL) diameter and blood flow, with systemic progesterone (P4) concentration during two transitional ovulatory seasons in mares. Variables of POF and CL/P4 were evaluated for 6days before and 17days after ovulation, respectively. Evaluations were performed during two consecutive estrous cycles in spring and fall seasons, and during the last estrous cycle of the season. There were significant correlations among POF and CL variables, and P4 concentration that ranged from 0.24 to 0.95, and among the ratios of different variables that ranged from 0.39 to 0.92. There were linear regressions (P<0.01-0.001) for all comparisons among different variables. The POF diameter before the first ovulation of the season was larger (P<0.05), and POF vascularity was less (P<0.05), than in the last estrous cycle during the season. The CL blood flow was less (P<0.01) during the last compared with first pre-ovulatory period of the season. The POF diameters were positively correlated (r=0.67) during the two pre-ovulatory periods of spring and fall. Results provide evidence that the POF affects CL diameter and blood flow, and subsequently P4 production, and that POF diameter is repeatable within the same individual during different seasons.
采用彩色多普勒超声研究母马两个过渡排卵季节中排卵前卵泡（POF）和黄体（CL）直径及血流与全身孕酮（P4）浓度之间的时间关系。分别在排卵前6天和排卵后17天评估POF和CL/P4的变量。评估在春季和秋季的两个连续发情周期以及该季节的最后一个发情周期进行。POF和CL变量与P4浓度之间存在显著相关性，相关系数范围为0.24至0.95，不同变量的比率之间的相关系数范围为0.39至0.92。不同变量之间的所有比较均存在线性回归（P<0.01 - 0.001）。该季节首次排卵前的POF直径较大（P<0.05），且POF血管化程度较低（P<0.05），与该季节最后一个发情周期相比。与该季节第一个排卵前期相比，最后一个排卵前期的CL血流量较少（P<0.01）。春季和秋季两个排卵前期的POF直径呈正相关（r = 0.67）。结果表明，POF影响CL直径和血流量，进而影响P4的产生，并且POF直径在不同季节的同一个体内是可重复的。
