It has been discovered that prolific sheep have one significant characteristics: their ovaries are more responsive than that of monovular sheep. When prolificacy is selected in the herds the responsiveness of ewe and cow to FSH can be enhanced. 研究发现:多胎绵羊具有对促性腺激素更敏感的卵巢反应性似乎是其与单胎品种的特征性差异之一,对牛、羊多胎性的选择会提高卵巢对促性腺激素反应的敏感性。