【摘要】 为探讨不同精粗比日粮对不同生理阶段杜泊绵羊生长性能、血清生化指标及经济效益的影响,本研究进行了2个试验。试验Ⅰ:选用体重20~35kg断奶杜泊羔羊40只(公、母各半),随机分成4组,每组10只,分别饲喂精粗比为40∶60(A组)、50∶50(B组)、60∶40(C组)、70∶30(D组)的日粮,试验期70d;试验Ⅱ:选用体重30~45kg生长期杜泊羊40只(公、母各半),随机分成4组,每组10只,分别饲喂精粗比为35∶65(E组)、45∶55(F组)、55∶45(G组)、65∶35(H组)的日粮,试验期70d。结果显示,试验Ⅰ:1随日粮精料比的增加,断奶杜泊公羊的平均日增重呈现增加趋势,而母羊为先增加后降低,总体A组显著低于其他3组(P<0.05),B、C、D组间差异均不显著(P>0.05);随日粮精粗比的增加,各组平均日采食量逐渐降低且差异显著(P<0.05),各组公羊料重比显著降低(P<0.05),而B组母羊料重比显著低于其他3组(P<0.05)。2各组试验羊血清中总蛋白、甘油三酯、血糖含量差异均不显著(P>0.05),而日粮精粗比对其他血清成分有不同的影响。3D组公羊平均日净利润比B、C组分别高53.02%、35.33%,B组母羊平均日净利润比C、D组分别高61.76%、54.49%。试验Ⅱ:1随日粮精料比的增加,生长期杜泊绵羊平均日增重基本呈现显著增加趋势(P<0.05),而G组母羊平均日增重最高且显著高于E组(P<0.05),F、G、H组间差异不显著(P>0.05)。随日粮精粗比的增加,各组平均日采食量逐渐降低(P<0.05),公羊的料重比逐渐降低(P<0.05),而母羊料重比呈现先降低后增加趋势,G组显著低于其他3组(P<0.05)。2日粮精粗比对各组试验羊血清中总蛋白、甘油三酯、血糖含量影响差异均不显著(P>0.05),而对其他血清成分有不同的影响。3H组公羊平均日净利润比F、G组分别高69.49%、52.13%,G组母羊平均日净利润比F组高1 282.61%。综合各项指标分析,断奶杜泊公羔羊日粮精粗比以60∶40较好,断奶杜泊母羔羊精粗比以50∶50较好,断奶羔羊混群饲养,日粮精粗比为50∶50较宜;生长期杜泊绵羊日粮精粗比均为55∶45较适宜。更多还原

【Abstract】 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:40weaned lambs with the 20 to 35kg body weight were divided into 4groups with 10 sheep in each group and provided 4different C/F diets:group A(40∶60),group B(50∶50),group C(60∶40),group D(70∶30)and the experiment lasted for 70d;TestⅡ:40growing sheep with the 30 to 45kg body weight were divided into 4groups with 10 sheep in each group and provided 4different 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 4groups(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 4groups(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∶40to weaned male lambs,while 50∶50to weaned female lambs,and the appropriate C/F was 50∶50if they were mixed fed.TestⅡshowed that the appropriate C/F was55∶45to both male and female growing sheep.更多还原