Abstract:In recent years,the mutton sheep industry in Yongjing County of Gansu Province has developed steadily,and the number of lamb has reached more than 600 000.The authors conducted a field survey of 133 sheep farmers in nine administrative villages in five towns of Yongjing County Province,the time of death,symptoms and environmental changes were recorded,observed and compared.The results showed that the death rate of lamb due to disease was 33.28%,the death rate of feeding management was 25.66%,the death rate of fodder and nutrition was 23.01%,the death rate of genetic factors was 18.05%.The death of lamb is closely related to heredity,feeding and management,nutrition level and epidemic disease prevention and control,it can significantly improve the survival rate of lamb and promote the healthy development of mutton sheep industry.
