草业学报2024，Vol.33Issue(3)：198-208,11.DOI:10.11686/cyxb2023191
低蛋白日粮中不同比例氨基酸对藏羊背腰最长肌肉品质、氨基酸和脂肪酸组成以及维生素和矿物质含量的影响
Effect of different ratios of amino acids in low-protein diets on muscle quality,amino acid and fatty acid composition,and vitamin and mineral contents of the longissimus dorsi muscle in Tibetan sheep
摘要
Abstract
The aim of this experiment was to investigate the effects of different ratios of the amino acids lysine and methionine in low-protein diets on the muscle quality,amino acid and fatty acid composition,and vitamin and mineral contents of the longissimus dorsi muscle of Tibetan sheep.Ninety healthy male lambs of Tibetan sheep(plateau type)with similar body weight[(15.60±0.10)kg]were selected and randomly divided into three groups of 30.Each group had five replicates of six lambs.The protein level in the dietary concentrate was 12%,and the three groups were as follows:LP-L group(1∶1 lysine to methionine);LP-M group(2∶1 lysine to methionine);and LP-H group(3∶1 lysine to methionine).The total experimental period was 97 days,including a 7-day pre-feeding period and a 90-day feeding period.Analyses of the longissimus dorsi muscle showed that:1)The thawing loss index was significantly lower in the LP-L group than in the LP-H group(P<0.05),and the cooking loss index and shear force index were significantly lower in the LP-L group than in the LP-M and LP-H groups(P<0.05);2)The different amino acid ratios did not significantly affect the amino acid composition in the longissimus dorsi muscle of each group(P>0.05);3)Among the unsaturated fatty acids in the longissimus dorsi muscle,trans-linoleic acid,docosahexatrienoic acid,and pentadecadienoic acid were present at significantly higher levels in the LP-L group than in the LP-M group(P<0.05);and heptadecadienoic acid,linoleic acid,and α-linoleic acid were present at significantly higher levels in the LP-L group than in the LP-M group and the LP-H group(P<0.05);4)The α-vitamin E content,γ-vitamin E content,and vitamin E index of the longissimus dorsi muscle were significantly higher in the LP-L group than in the LP-M group(P<0.05),while the calcium content was significantly higher in the LP-L group than in the LP-M group(P<0.05).In conclusion,a diet with a 1∶1 ratio of lysine to methionine can increase the contents of unsaturated fatty acids,vitamins,and minerals in the muscle,thereby improving meat quality,and the ratio of lysine to methionine in the diet does not adversely affect the amino acid composition of the meat.关键词
高原型藏羊/低蛋白/营养调控/肉品质/氨基酸/脂肪酸/维生素/矿物质Key words
plateau-type Tibetan sheep/low protein/nutritional regulation/meat quality/amino acids/fatty acids/vitamins/minerals引用本文复制引用
张峰硕,季秋蓉,何婷莉,苏曲杨昂毛,王志有,侯生珍,桂林生..低蛋白日粮中不同比例氨基酸对藏羊背腰最长肌肉品质、氨基酸和脂肪酸组成以及维生素和矿物质含量的影响[J].草业学报,2024,33(3):198-208,11.基金项目
青海省科技厅帅才科学家项目(2022NK169)资助. （2022NK169）
