7月龄陶赛特×小尾寒羊F_1代公母羔羊肌肉化学成分的比较研究

Comparative Study on Muscle Chemical Composition of Male and Female Crossbred Lambs between Poll Dorset and Small Hail Han Sheep Slaughtered at 7-month-old

本试验对7月龄陶赛特×小尾寒羊F1代(简称陶×寒F1)公母羔羊肌肉化学成分进行了比较研究。试验选择了在集约化饲养方式下饲养的7月龄陶赛特×小尾寒羊F1代公羔、母羔各5只进行屠宰,分别取背最长肌后测定常规营养成分、氨基酸、长链脂肪酸、胆固醇、矿物元素等养分的含量。结果表明,陶×寒F1公羔、母羔之间在背最长肌中干物质、粗蛋白质、粗脂肪、粗灰分、钙、磷等含量上均无显著差异(P>0.05)。各种氨基酸含量、总必需氨基酸含量、总非必需氨基酸含量、总氨基酸含量差异均不显著(P<0.05)。公羔与母羔背最长肌中大部分脂肪酸的含量、总不饱和脂肪酸含量均无显著差异(P>0.05),但公羔背最长肌中亚油酸的含量提高20.3%(P<0.05),胆固醇含量降低约32%(P<0.05)。羔羊不同性别之间背最长肌中的镁、锌、铜、锰含量没有显著差异(P>0.05),但母羔背最长肌中的铁含量比公羔的高约26%(P<0.05)。因此,7月龄陶×寒F1公羔、母羔肌肉的营养价值基本相同。

The experiment was undertaken to comparatively study muscle chemical composition of crossbred male and female lambs of Poll Dorset × Small Tail Han Sheep. Five male and female lambs,respectively chosen from the flocks raised in intensive production system, were slaughtered at age of 7-month-old. Longissimus dorsi （LD） was sampled and muscle chemical composition was determined. The results showed that there was no significant difference in the contents of dry matter, crude protein, crude fat, ash, calcium, and phosphorus, various amino acids, total essential amino acids, total non-essential amino acids, and total amino acids, fatty acids, total unsaturated fatty acids, Mg, Zn, Cu, and Mn in LD between male and female lambs （P〉 0.05）. The content of linoleic acid in LD of male lambs, however, was increased by 20.3 % （P〈0.05） and cholesterol decreased by 32% （P〈0.05） compared with female lambs. Iron in LD of female lambs was higher about 26% than that of males. The present study indicated that the nutritional value of Longissimus dorsi was the same between male and female lambs slaughtered at age of 7-month-old.