日粮能量对初情期前母猪外周血清FSH、LH释放的影响

Effects of dietary energy on release of FSH and LH in prepubertal gilts

选杜长大三元杂交母猪24头(140日龄)分3个组,高能组、中能组、低能组。试验处理20 d,每5 d采血1次,离心,-20℃冰箱储存,然后放射免疫分析(RIA)。结果表明:外周血浆FSH、LH浓度在不同日粮能量水平饲养后,高能组急剧上升,到第10天达到高峰,然后逐渐下降,在处理第20天接近恢复试验前水平。低能组缓慢降低,第10天到最低点,然后逐渐恢复,在处理第20天接近恢复试验前水平。外周血浆FSH、LH浓度在高能组与低能组于处理第5天差异显著(P<0.05),第10天差异极显著(P<0.01),说明能量通过下丘脑-垂体-卵巢轴影响初情期前母猪生殖机能。

The experiments were conducted to examine influences of dietary energy on profiles of FSH, LH concentrations in peripheral plasma. Twenty-four gilts （Duroc × Landrace × Large Yorkshire） at the age of 140 days were assigned to three energy treatments for a period of 20 days： high energy group （HG）, middle energy group （MG）, and low energy group（LG）. The results showed that concentrations of FSH and LH in peripheral plasma increased quickly in HG and reduced slowly in LG,respectively,till the day 10 compared to those in MG, but on day 20 recovered to the basement level before treatment. Concentrations of FSH as well as of LH were different significantly （P 〈0.05） on day 5 and very significantly （P 〈 0. 01） on day 10 between energy treatments, with those in HG higher than those in LG. The results demonstrated that dietary energy affects reproductive performance in prepubertal gilts through hypothalamus-pituitary-ovaries axis.