This document discusses infertility in sows and rabbits. For sows, infertility can be caused by anoestrus (lack of estrus), conception failure, or pregnancy failure. Seasonal infertility is also common in sows during summer and autumn. In rabbits, non-infectious factors like nutrition (pregnancy toxemia) and infectious diseases (syphilis, pasteurellosis) can cause infertility. Proper management and early detection of infertility can help reduce costs for farmers.