Effect of Different Dietary Concentrate to Forage Ratios on Growth Performance,Serum Biochemical Indexes and Economic Benefits of Dorper Sheep

Two experiments were conducted to investigate the effect of different dietary concentrate to forage ratios (C/F) on the growth performance,serum biochemical indexes and economic benefits of Dorper sheep.TestⅠ:40 weaned lambs with the 20 to 35 kg body weight were divided into 4 groups with 10 sheep in each group and provided 4 different C/F diets:group A (40:60),group B (50:50),group C (60:40),group D (70:30) and the experiment lasted for 70 d;TestⅡ:40 growing sheep with the 30 to 45 kg body weight were divided into 4 groups with 10 sheep in each group and provided 4 different C/F diets:group E (35:65),group F (45:55),group G (55:45),group H (65:35) and the experiment lasted for 70 d.The results showed as follows:In the testⅠ:①With the increase of C/F,the ADG of rams increased,but that of ewes was increased initially and then decreased,the ADG of group A in male and female were significantly lower than other three groups (P<0.05),and there were no significant differences in group B,C and D (P>0.05);ADFI of male and female were reduced significantly (P<0.05);F/G was decreased significantly of ram (P<0.05),while that of group B was significantly lower than the other three groups of ewe (P<0.05).②There were no significant differences of TP,TG and Glu in 4 groups (P>0.05),but C/F had different effects on other serum components.③The average net profit in group D of rams was 53.03% higher than group B,and 35.33% higher than group C,while that in group B of ewes was 61.76% higher than group C,and 54.49% higher than group D.In the testⅡ:①With the increasing of the C/F,the ADG of the growing rams was increased gradually,but group G of ewe was significantly higher than group E (P<0.05),and there were no significant differences in group F,G and H (P>0.05).ADFI of male and female was reduced significantly (P<0.05);F/G was decreased significantly of ram (P<0.05),while that of ewes was decreased initially and then increased,group G was significantly lower than the other three groups (P<0.05).②There were no significant differences in TP,TG and Glu in 4 groups (P>0.05),but C/F had different effects on other serum components.③The average net profit in group H of ram was 69.49% higher than group F and 52.13% higher than group G.While that in group G of ewe was 1 282.61% higher than group F.Under the conditions of this experiment,the appropriate C/F was 60:40 to weaned male lambs,while 50:50 to weaned female lambs,and the appropriate C/F was 50:50 if they were mixed fed.TestⅡ showed that the appropriate C/F was 55:45 to both male and female growing sheep.