短期限饲对初情期前母猪和初产母猪繁殖机能的影响

作者探讨短期限饲对初情期前母猪和初产母猪繁殖机能的影响及其机理。当体重和脂肪与肌肉比例无变化,短期限饲影响初情期前母猪卵巢繁殖功能。葡萄糖和胰岛素在初情期前母猪繁殖机能中有重要作用。胰岛素是营养与繁殖之间的一个媒介。无内源性激素影响时,短期限饲调节卵巢繁殖功能。在限饲期间,促性腺激素在白天出现明显节奏性释放。短期限饲通过胰岛素影响初产母猪卵泡发育、断奶后发情间隔和排卵率。胰岛素是营养与胚胎存活率之间的介质。短期限饲由于限饲时间不同对初产母猪胚胎存活率影响也不同。分析营养与繁殖机能关系,调节营养使母猪发挥最大繁殖潜力,促进养猪业发展。

Impact on Prepuberty Gilt and Primiparous Sows by Feeding of Short-term Restriction

The goals of this article is to investigate impact and manchisms on reproductive capability in prepubertal gilts and primiparous sows by feeding of short-term restriction.While no changes in body weight and ration of fat to musle,ovary function was affected by feeding of short-term restriction.Glucose and insulin play an important role in reproductive unction of prepubertal gilts.Insulin is a mediator between nutrition and reproductive function of ovaries of prepubertal gilts Non-gonadotropin,ovary function was affected by feeding of short-term restriction.During feeding restriction,a distinct diunal rythym in gonadotropin secretion was observed.Effects on follicle development,weaning-to-estrus interval and ovulation rate of primiparous sows through insulin by feeding of short-term rerm restriction are obivious.Insulin is a mediator between nutrition and survival rate of embryo.Impact on survival rate of embryo of primiparous sows is different due to the differnt time of restriction.Discovering relationship between nutrition and reproductive function is to study its manchism,regulating nutrition is to promote the reproductive portential of sows in order tp promote develoment of swine industry.