乳果糖替代饲用抗生素对AA肉仔鸡生产性能和屠宰性能的影响

The Effects of Replacing Antibiotics Feed Additive with Lactulose on Production Performance and Slaughter Characteristics of the AA Broilers

【目的】研究乳果糖替代饲用抗生素后对AA肉仔鸡生产性能和胴体品质的影响。【方法】选用180只1日龄AA肉仔鸡,随机分成5组,每组3个重复,每个重复12只。阴性对照组饲喂基础日粮;抗生素组添加0.3 g/kg那西肽和0.25 g/kg硫酸粘杆菌素预混剂;试验组分别添加0.5%、1.0%和1.5%乳果糖。测定生产性能及胴体指标。【结果】各组肉仔鸡活体重分别为2 164.22、2 057.58、2 101.43、2 208.86、2 172.00 g,差异不显著(P>0.05)。料重比分别为2.15、1.90、1.95、1.96、2.02,抗生素组显著低于阴性对照组13.16%(P<0.05),但其它各组均差异不显著(P>0.05)。乳果糖组肉仔鸡平均日增重、平均日采食量较抗生素组均有所提高,但差异不显著(P>0.05)。添加抗生素、1.0%、1.5%乳果糖肉仔鸡的存活率显著提高。乳果糖在很大程度上改善了肉仔鸡的胴体品质,其中0.5%、1.0%乳果糖组比抗生素组腹脂率分别降低3.48%(P>0.05)、17.24%(P>0.05)。【结论】添加不同水平乳果糖替代饲用抗生素后均具有提高肉仔鸡生产性能、改善胴体品质的趋势,综合生产性能和胴体品质来看,1.0%乳果糖的替代效果较佳。

[ Objective]The experiment was conducted to study the effects of replacing antibiotics teed additive with lactulose on performance, slaughter performance of the AA broilers. [ Method] One hundred and eighty one - day - old AA broilers were randomized into five groups with 3 replicates per group and 12 chickens per replicate. Negative control group was fed with basal diet; antibiotics group was fed with diet supplemented with 0.30 g/kg Nosiheptide and 0.25 g,/kg Colistin sulfate premix; the treatment groups were fed with diet supplemented with 0. 5%, 1. 0% and 1. 5% of lactulose, respectively. The production performance and carcass quality were determined. [ Result] The live body weight of broilers were 2 164.22,2 057.58, 2 101.43, 2 208.86 and 2 172.00 g, respectively, and there was no significant difference （ P 〉 O. 05）. The feed conversion ratio in each group were 2.15, 1.90, 1.95, 1.96 and 2.02, compared with the negative control group, the feed conversion ratios by birds fed antibiotics diets were lower than those by a margin of 13.16% （P 〈 0.05 ）, but the others there showed no significant difference（ P 〉 0.05 ）. The live body weight, daily weight gain and daily feed intake of broilers fed with lactulose were improved, but there were no significant difference （ P 〉 0.05 ）. The survival rate increased significantly by diets supplementation with antibiotics, 1.0% and 1.5% lactulose. The carcass quality was improved, and percentage of abdominal fat by birds fed 0.5% and 1.0% lactulose diets were reduced by 3.48% （ P 〉 0.05 ） and 17.24% （ P 〉 0.05）. [ Conclusion ] Replacing antibiotics feed additive with different levels of lactulose had the trend of improving production performance and carcass quality. Evaluation of production performance and carcass quality of the broilers, replacing antibiotics feed additive with 1.0% of lactulose was relatively better.