During the lactation,LH,E 2 and P 4 levels kept low . E 2 reached its peak at breeding stage. LH and P 4 reached their peaks on the 15th day of pregnancy.

• 在母猪泌乳阶段 ,促黄体素 (LH) 雌激素 (E2 )和孕酮 (P4 )的水平都较低 ,在配种阶段 ,雌激素分泌达到峰值 ,在怀孕 15d时 ,促黄体素和孕酮的分泌达到峰值 ;