不同放牧强度和补饲水平下呼伦贝尔羊肉中氨基酸和脂肪酸组成分析  

Amino Acid and Fatty Acid Profile of Hulunbuir Lambs under Different Grazing Intensities and Supplementary Feeding Levels

作　　者：季晶 杨欢 徐民乐 张英俊[2] 赵新钢 李贞 张博彦 罗海玲 JI Jing;YANG Huan;XU Min-le;ZHANG Ying-jun;ZHAO Xin-gang;LI Zhen;ZHANG Bo-yan;LUO Hai-ling(State Key Laboratory of Animal Nutrition and Feeding,College of Animal Science and Technology,China Agricultural University,Beijing 10093,China;Grassland Managementand Utilization Laboratory,Ministry of Agricultureand Rural Affair,College of Grassland Science and Technology,China Agricultural University,Beijing 10093,China)

机构地区：[1]中国农业大学动物科学技术学院畜禽营养与饲养全国重点实验室,北京100193 [2]中国农业大学草业科学与技术学院农业农村部草地管理与合理利用重点实验室,北京100193

出　　处：《草地学报》2024年第7期2273-2282,共10页Acta Agrestia Sinica

基　　金：国家自然科学基金重大项目(32192463);国家肉羊产业技术体系(CARS-38)资助。

摘　　要：试验旨在研究不同放牧强度和补饲水平下羊肉氨基酸和脂肪酸组成的差异。在内蒙古呼伦贝尔草原选取3月龄呼伦贝尔羊72只,采用双因素(放牧强度和补饲水平)随机区组试验设计,放牧强度包括适度放牧(MG)和重度放牧(HG);补饲水平包括不补饲(NS)、1%体重补饲量(S1)和2%体重补饲量(S2),共6个处理。结果表明:MG羔羊肌内脂肪(IMF)含量显著高于HG;S2羔羊IMF,蛋白质含量显著高于NS。HG和S2羊肉总氨基酸含量显著高于MG和NS;相较于NS,S2羊肉中山萮酸和二十三碳酸含量分别降低了17.14%和20.59%,t 10,c 12共轭亚油酸和总不饱和脂肪酸含量分别增加了30.91%和21.97%,n6/n3比值小于5。综上,适度放牧结合补饲的饲养策略,有利于生产具有优质蛋白质和脂肪酸组成的羊肉,并有利于草原的可持续发展。To investigate the differences in amino acid and fatty acid composition of lamb meat under different grazing intensity and supplementary feeding level,seventy-two 3-month-old male Hulunbuir lambs were selected from the Inner Mongolia,and a two-factor(grazing intensity and supplementary feeding level)randomized block design was used.The grazing intensity included moderate grazing(MG)and heavy grazing(HG);supplementary feeding level included no supplementation(NS),1%body weight supplementation(S1)and 2%body weight supplementation(S2),a total of 6 treatments.The results showed that the intramuscular fat(IMF)content of MG lambs was significantly higher than HG;the IMF and protein contents of S2 lambs were significantly higher than NS.The total amino acid contents of HG and S2 lambs were significantly higher than those of MG and NS.Compared to NS,S2 lamb decreased by 17.14%and 20.59%in docosanoic acid and tricosanoic acid contents,respectively,and increased by 30.91%and 21.97%in t10,c12-conjugated linoleic acid and total unsaturated fatty acid contents,respectively,with an n6/n3 ratio of less than five.In summary,the feeding regimes of moderate grazing combined with supplementary feeding is conducive to the production of lamb meat with high-quality protein and fatty acid composition,as well as to the sustainable development of grassland.

关 键 词：放牧强度 补饲水平 羊肉 氨基酸 脂肪酸 

分 类 号：S826[农业科学—畜牧学]