Abstract: In order to explore the factors of investigate the conception rate on Xinjiang region Simmental cows. The effects on conception rate were analyzed by SAS 8.1 GLM,between the different effect levels by Duncan multiple comparison and analysis its effect on estrus conception rate. The results showed that different breeding season pregnancy rate of Simmental cows had significant effects (P<0.01),the pregnancy rate in spring was significantly lower than summer,autumn and winter conception rate on Simmental cow (P<0.01),the highest pregnancy rate in winter (64.7%),pregnancy rate lowest in spring (40.0%);Of Simmental bulls and cows with conception rate had no significant effect (P>0.05);Cow age on pregnancy rate of Simmental cows had significant effects (P<0.01),and with increasing age,pregnancy rate of dams has decreased. In this paper,a large number of records information on factors affecting pregnancy rate of Simmental cows for analysis,which will help to improve the pregnancy rate of dams,and ultimately improve the economic efficiency of cattle.

Key words: Simmental cows; conception rate; breeding season; breeding bulls; cow age