主波形成之優勢卵泡較次波, 3rd波形成之優勢卵泡為大
http://www.sciencedirect.com/science/article/pii/S0737080607800128
Major and Minor Follicular waves During the Equine Estrous Cycle
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Summary
Follicular waves were characterized by a mathematical method for estrous cycles occurring during the fall (n=9) and spring (n=20) in mares of pmnarily Quarter Horse and Appaloosa breeding. Waves were classified as major (diver- gence of follicles of a wave into dominant and subordinates) and minor (no divergence). The major waves were sub- grouped into secondary waves (emerging during esmls or early diestrus and giving origin to a dominant anovulatory follicle or a diestrous ovulation) and primary waves (emerg- ing during diestms and giving origin to the primary or estrous ovulation). The primary waves originated on mean Day 7.4±0.5 (ovulation=Day 0) when the follicles were a mean of 12.l±0.5mm. Day of emergence of primary waves was positively correlated (P<0.05) with length ofintemvulatory inter- vals. The mean intervals from emergence to divergence and from divergence to ovulation were 7.4±0.5 and 7.2±0.4 days, respectively. Secondary waves and minor waves each occurred in 8 of 34 cycles and occurred more commonly (P<0.05) during the spring than during the fall. Six of the 8 secondary waves emerged before ovulation, at the time of reported FSH increases in some mares. Divergence into a dominant and subordinate follicle occurred 3 days sooner (P<0.05) after wave emergence for secondmy waves than for primary waves. In addition, the maximal diameter of the dominant follicle for secondary waves was significantly smaller than for primmy waves and maximal diameter was reached earlier (mean maximal diameter of largest follicle: 37.2±1.0 and 45.8±1.0 roan, respectively). Values for all follicular end points, except diameteroffollicles onday of wave emergence, were smaller (P<0.05) for minor waves than for primary waves. The minor and secondary waves differed only in the occurrence of divergence with formation of a large dominant follicle in the secondmy waves. The length of the interovulatory interval and all exam- ined characteristics of primary waves were not different between fall and spring estrous cycles; the greater follicular activity previously reported for the spring was attributable to more secondary and minor waves. Minor waves were some- times located close to the day of emergence of a primary wave, indicating that a broad base of follicular activity is sometimes associated with the emergence of primmy waves.
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