颗粒日粮中添加柠条对滩羊生长性能、血液生化指标、瘤胃发酵及羊肉品质的影响

[目的]研究颗粒日粮中添加柠条对滩羊生长性能、血液生化指标、瘤胃发酵及羊肉品质的影响。[方法]选择体重相近的健康去势滩羊20只,随机分成两组,每组10只;对照组饲喂含有10%菊花粕的颗粒日粮,试验组饲喂含有6%柠条和4%菊花粕的颗粒日粮;开展周期为50天的育肥试验,测定滩羊的生长性能指标;育肥试验结束后,测定滩羊血液生化指标;屠宰后测定滩羊的屠宰性能指标,并取瘤胃液测定瘤胃发酵指标;取背腰最长肌,测定粗脂肪、粗蛋白、氨基酸含量以及脂肪酸组成。[结果]试验组和对照组滩羊的初始体重和终末体重无显著（P>0.05）差异;试验组平均日增重较对照组降低10.84%,差异不显著（P>0.05）;对照组平均日采食量显著（P<0.05）高于试验组;两组试验羊料肉比相同。试验组滩羊血清中的总蛋白含量显著（P<0.05）高于对照组,其他血液生化指标无显著（P>0.05）差异。对照组滩羊屠宰率比试验组高1.59%,差异不显著（P>0.05）;两组试验羊肝脏重、肝脏指数、心脏和肺脏重、心脏和肺脏指数差异不显著（P>0.05）。试验组滩羊瘤胃液中丁酸浓度显著（P<0.05）高于对照组,异戊酸浓度显著（P<0.05）低于对照组。对照组和试验组滩羊背腰最长肌中分别检测出18种和20种脂肪酸,粗蛋白含量分别为17.51%和20.92%,粗脂肪含量分别为3.22%和3.89%,总氨基酸含量分别为13.25%和14.09%。[结论]颗粒日粮中加入柠条对滩羊生长性能、血液生化指标和屠宰性能影响不明显,但可改善瘤胃发酵,丰富羊肉中脂肪酸组成及含量,增加肉中粗蛋白、粗脂肪和氨基酸含量。

Effects of Adding Caragana korshinskii in Pelleted Diet on Growth Performance,Blood Biochemical Indicators,Ruminal Fermentation and Mutton Quality of Tan Sheep

[Objective] To assess the effects of adding Caragana korshinskii in pelleted diet on growth performance, blood biochemical indicators, ruminal fermentation and mutton quality of Tan sheep. [Method] A total of 20 healthy castrated Tan sheep with similar weights were selected and randomly divided into 2 groups with 10 individuals for each group. The control group was fed with pelleted diet containing 10% chrysanthemum meal, and the experimental group was fed with pelleted diet containing 6% Caragana korshinskii and 4% chrysanthemum meal instead. A 50-day fattening experiment was conducted, and the growth performance indicators of the Tan sheep were determined; after the fattening experiment, the blood biochemical indexes were measured; the slaughter performance indicators were evaluated, and the ruminal fluid samples were collected after slaughter to assess the ruminal fermentation indicators; the contents of crude fat, crude protein and amino acids as well as the contents and composition of fatty acids in longissimus dorsi muscle were determined. [Result] No significant （P>0.05） differences in initial weights and final weights in the fattening experiment between the experimental group and the control group were observed; while the average daily gain of the experimental group was reduced by 10.84% compared with the control group, no significant difference was found （P>0.05）; the average daily feed intake of the control group was significantly （P<0.05） higher than that of the experimental group; the two groups had the same feed to gain ratio. The experimental group had significantly （P<0.05） higher serum total protein concentration compared with the control group, and there were no significant （P>0.05） differences in the other tested blood biochemical indexes. The slaughter rate of the control group was 1.59% higher than that of the experimental group, but no significant （P>0.05） difference was observed; there were no significant （P>0.05） differences in liver weights, liver indexes, heart and lung weights and heart and lung indexes between the experimental group and the control group. The experimental group had significantly （P<0.05） higher butyric acid concentration and significantly （P<0.05） lower isovaleric acid concentration in ruminal fluid compared with the control group. A total of 18 and 20 kinds of fatty acids were determined in longissimus dorsi muscle of the control group and the experimental group, respectively. The contents of crude protein, crude fat and total amino acids of the control group and the experimental group were 17.51% and 20.92%, 3.22% and 3.89%, and 13.25% and 14.09%, respectively. [Conclusion] Addition of Caragana korshinskii in pelleted diet has no obvious impacts on most of the indicators associated with growth performance, blood biochemistry and slaughter performance of Tan sheep, but improves the ruminal fermentation and enriches the fatty acids composition and concentrations as well as increases the contents of crude protein, crude fat and total amino acids in mutton.