7月龄和13月龄陶赛特×小尾寒羊F_1代羔羊肌肉化学成分的比较研究

Comparative Study on Muscle Chemical Composition of Crossbred Male Lambs between Poll Dorset and Small Hail Han Sheep Slaughtered at Ages of 7-and 13-month-old

本试验比较研究了无角陶赛特(父本)×小尾寒羊(母本)的杂交一代羔羊(简称为陶×寒F1)分别在7、13月龄屠宰时对羔羊肉化学成分指标的影响。结果表明,7、13月龄的陶×寒F1羔羊的背最长肌中,干物质、粗蛋白质、粗脂肪、粗灰分、钙、磷等含量均无显著差异(P>0.05)。7月龄羔羊背最长肌中的谷氨酸、苏氨酸、亮氨酸的含量均显著高于13月龄羔羊(P<0.05);组氨酸含量则显著低于13月龄羔羊(P<0.05),其它氨基酸含量与总必需氨基酸含量、总非必需氨基酸含量、总氨基酸含量2个月龄羔羊之间均无显著差异(P>0.05)。除7月龄羔羊背最长肌中亚油酸的含量较13月龄高出近45%(P<0.05)外,其它脂肪酸的含量、总不饱和脂肪酸含量、总不饱和脂肪酸/总饱和脂肪酸、胆固醇含量2个月龄羔羊之间均无显著差异(P>0.05)。与7月龄羔羊相比,13月龄羔羊背最长肌中的镁、锌、铜、锰含量均有提高趋势(P>0.05),其中铁含量增加17.2%。因此,13与7月龄陶×寒F1羔羊肌肉的营养价值基本相同。

The experiment was undertaken to comparatively study muscle chemical composition of crossbred male lambs of Poll Dorset × Small Tail Han Sheep at ages of 7-and 13-month-old.Five 7-and 13-month-old male lambs,selected from the flocks raised in intensive production system,were slaughtered.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 in LD between 7-and 13-month-old male lambs（P〈0.05）.The contents of glutanmic acid,threonine,leucine in LD of 7-month-old male lambs was markedly higher than that of 13-month-old male lambs（P〈0.05）,but histidine was lower.There was no significant difference in the contents of the other amino acids,total essential amino acids,total non-essential amino acids,and total amino acids.The content of linoleic acid in LD of 7-month-old male lambs was higher about 45% than that of 13-month-old male lambs.There was no significant difference in the contents of the other fatty acids,fatty acids,total unsaturated fatty acids,total unsaturated fatty acids to total saturated fatty acids ratio（P〈0.05）.The contents of Mg,Zn,Cu,and Mn in LD of 13-month-old male lambs showed increasing tendency,and iron was increased by 17.2%（P0.05） compared with 7-month-old male lambs.The present study indicated that the nutritional value of Longissimus dorsi was the same between 7-and 13-month-old male lambs.