1. During tupping season, according to the number of ewes in estrus they were divided into three groups at random, i. e. first test group's ewes were inseminated and at the same time injected LRH-A340 μ g;
在河北细毛羊配种季节，根据发情羊只数，随机分成3组，即试验1组：在输精的同时每只羊肌注LRH－A340μg；