2. Anestrus: No sexual activity takes place. Anestrus lasts between three and four months.

休情期:没有性活跃发生的时期。通常持续三到四个月。
3. At present, sow reproductive capacity defect result from tong
anestrus and decreased live pigs born, and then open, abortion, underpriviled Rig, mummified fetus, embryonic mortality etc.

分析了造成母猪繁殖能力低的因素主要表现为乏情期长和产仔数低,其次是不孕,流产,产弱仔,产木乃伊胎及死胎等。