This research aimed to study the effect of dietary nutrient levels on the development of late pregnancy ewes and embryos.Sixty-six primiparous and healthy Hu ewes with double lambs were provided with TMR diets ad libitum for the first 90 days of pregnancy,and the ewes((44.45±2.2)kg body weight)were randomly divided into 3groups with 11 replicates for each group and 2ewes per pen.Each group was offered the dietary with the same concentrate supplement and forage but the different ratio of concentrate/forage f...