饲粮中添加不同生物制剂对杜寒杂交肉羊生产性能和屠宰性能的影响

本试验旨在比较饲粮添加不同生物制剂对杜寒杂交肉羊生产性能、屠宰性能、组织器官发育及肉品质的影响。采用单因素试验设计,选取平均体重约为32 kg的杜寒杂交F1代肉羊160只,随机分为5组,每组4个重复,每个重复8只。对照组采用基础饲粮,试验组分别添加21 mg/kg莫能菌素、4×109CFU/kg地衣芽孢杆菌、3.2×109CFU/kg酿酒酵母菌、1.1 g/kg复合生物制剂(地衣芽孢杆菌≥6×109CFU/g、酿酒酵母菌≥4×109CFU/g、碱性蛋白酶≥1 000 U/g)。预试期10 d,正试期56 d,每2 d记录1次采食量,每20 d进行1次称重,当复合生物制剂组羊只的平均体重达到约50 kg时,每组选取10只羊进行屠宰,测定其屠宰性能、组织器官重量和肉品质指标。结果表明:1)复合生物制剂组平均日增重、屠宰率显著高于对照组(P0.05);地衣芽孢杆菌组和复合生物制剂组料重比显著低于对照组(P0.05)。2)地衣芽孢杆菌组、酿酒酵母菌组、复合生物制剂组复胃重量均显著高于对照组(P0.05),复合生物制剂组复胃重量占宰前活重比例显著高于对照组和莫能菌素组(P0.05);地衣芽孢杆菌组、酿酒酵母菌组、复合生物制剂组小肠重量及其占宰前活重比例均显著高于对照组、莫能菌素组(P0.05)。3)酿酒酵母菌组肾脏重量占宰前活重比例显著高于对照组(P0.05),其他内脏器官重量占宰前活重比例在各组间无显著差异(P0.05)。4)各组肉品质指标差异不显著(P0.05)。综合得出,从作为饲料添加剂对肉羊生产性能作用效果来看,地衣芽孢杆菌、酿酒酵母菌、复合生物制剂可以替代莫能菌素,地衣芽孢杆菌好于酿酒酵母菌,复合生物制剂最佳。

Effects of Dietary Supplementation of Different Biological Agents on Production Performance and Slaughter Performance of Dorper ×Thin-Tailed Han Crossbred Mutton Lambs

This experiment was conducted to study the effects of dietary supplementation of different biological agents on production performance, slaughter performance, tissue and organ development and meat quality of Dorper×thin-tailed Han crossbred mutton lambs.One hundred and sixty Dorper ×thin-tailed Han crossbred F1 mutton lambs ( weighted about 32 kg) were randomly assigned into 5 groups with 4 replicates in each group and 8 mutton lambs per replicate according to a single factor experimental design.Control group used a basal diet, 21 mg/kg monensin, 4×109 CFU/kg Bacillus licheniformis, 3.2×109 CFU/kg Saccharomyces cerevisiae and 1.1 g/kg compound biological agents (Bacillus licheniformis≥6×109 CFU/g, Saccharomyces cerevisiae≥4×109 CFU/g and alkaline proteinase≥1000 U/g) were supplemented in experimental groups.The pretest lasted for 10 d, and the test lasted for 56 d.Feed intake was recorded every 2 d and lambs were weighed every 20 d.Ten lambs from each group were slaughtered to determine slaughter performance, tissue and organ weight and meat quality after body weight of lambs in compound biological agents group reached about 50 kg.The re-sults showed as follows:1) for average daily gain and dressing percentage, compound biological agents group was significantly higher than control group ( P<0.05); feed to gain ratio in Bacillus licheniformis group and compound biological agents group was significantly lower than that in control group ( P<0.05).2) Complex stomach weight in Bacillus licheniformis group, Saccharomyces cerevisiae group and compound biological a-gents group was significantly higher than that in control group ( P<0.05) , and the percentage of complex stom-ach weight of live weight before slaughter ( LWBS ) in compound biological agents group was significantly higher than that in control group and monensin group ( P<0.05); small intestine weight and its percentage of LWBS in Bacillus licheniformis group, Saccharomyces cerevisiae group and compound biological agents group were significantly higher than those in control group and monensin group ( P<0.05) .3) The percentage of kid-ney weight of LWBS in Saccharomyces cerevisiae was significantly higher than that in control group, while the other internal organ weight percentages of LWBS were not significantly different among groups ( P>0.05) .4) Meat quality indexes had no significant difference among groups ( P>0.05) .In conclusion, from the effects as feed additives on production performance of mutton lambs, Bacillus licheniformis, Saccharomyces cerevisiae and compound biological agents can replace monensin, and Bacillus licheniformis is better than Saccharomyces cerevisiae, and compound biological agents has the best effect.