天然放牧条件下不同性别的苏尼特羊肌肉常规营养成分、氨基酸组成及矿物质含量的比较

Effect of sex on the contents in conventional nutrient,amino acid and mineral of muscles of Sunite sheep under natural grazing conditions

试验研究性别对苏尼特羊肌肉营养价值的影响。选择天然草场放牧、8月龄、健康当年公羔与母羔各8只,禁食12h、禁水2h后屠宰,取背最长肌、臂三头肌、股二头肌、臀肌等,测定氨基酸、矿物元素和常规营养成分等指标。结果显示,公羔背最长肌的初水分含量显著高于母羔(P<0.05)。与母羔相比,公羔背最长肌中Ser、Glu、Val、Lys和Arg含量、股二头肌中Gly和Pro含量、臂三头肌中Ser、Thr、Val、Leu、Phe、Lys、His、Arg和Pro含量及臀肌中Leu和Lys含量显著降低(P<0.05),但臂三头肌中Tyr含量、臀肌中Gly含量显著升高(P<0.05)。公羔股二头肌和臂三头肌中EAA/TAA比例显著高于母羔(P<0.05)。与母羔相比,公羔背最长肌中Fe和Cr含量、股二头肌中Zn含量、臂三头肌中Zn含量、臀肌中K、Mg、P、Cr、Fe、Cu、Mn、Mo、Pb和Se含量均显著高于母羔、(P<0.05),股二头肌中Cd含量、臂三头肌中Mg、Co、Cr、Cu、Fe和Se含量均显著低于母羔(P<0.05)。

The experiment studied the effect of sex on the contents in conventional nutrient,amino acid and mineral of muscles of Sunite sheep under natural grazing conditions.Eight 8-month-old healthy male lambs and eight female lambs were slaughtered after fasting for 12 hours and water deprivation for 2 hours.The longissimus dorsi muscle,triceps brachii muscle,biceps femoris muscle and gluteus muscle were used to determine amino acids,mineral elements and conventional nutrients.The results showed that the initial moisture content of longissimus dorsi was significantly higher than that of female lambs(P<0.05).Compared with female lambs,the contents of SER,Glu,Val,Lys and Arg in longissimus dorsi,Gly and pro in biceps femoris,Ser,THR,Val,Leu,Phe,Lys,His,Arg and Pro in triceps brachii and Leu and Lys in gluteus were significantly lower in male lambs(P<0.05),but Tyr and Gly in triceps brachii and gluteus were significantly higher in female lambs(P<0.05).The EAA/TAA ratio in biceps femoris and triceps brachii of male lambs was significantly higher than that of female lambs(P<0.05).Compared with female lambs,Fe and Cr content in the longissimus dorsi muscle,Zn content in biceps femoris muscle,Zn content in triceps brachii muscle,K,Mg,P,Cr,Fe,Cu,Mn,Mo,Pb and Se in gluteal muscles were significantly higher than female lambs(P<0.05),Cd content in biceps femoris and Mg,Co,Cr,Cu,Fe and Se content in triceps brachii were significantly lower than female lambs(P<0.05).