不同周龄固始鸡肉质特性比较分析

Comparison on Meat Quality Characteristics in Gushi Chicken at Different Weeks of Age

为研究青年鸡与老龄鸡肉质特性的差异,分别测定20周龄和55周龄固始母鸡的屠体性状、肉品质、氨基酸组成、脂肪酸组成以及肌纤维特性,比较青年鸡与老龄鸡的肉质特性。结果显示:55周龄固始鸡活重、屠体重、肌间脂带宽显著高于20周龄(P<0.05),半净膛率、全净膛率显著低于20周龄(P<0.05);55周龄胸肌肌内脂肪含量显著高于20周龄(P<0.05),亮氨酸含量显著低于20周龄(P<0.05),胸肌中其他17种氨基酸以及腿肌中18种氨基酸含量在两个时期差异不显著(P>0.05),55周龄胸肌中油酸含量显著高于20周龄(P<0.05),其他11种脂肪酸在两个时期差异不显著(P>0.05);55周龄腿肌肌纤维直径显著大于20周龄(P<0.05),肌纤维密度显著小于20周龄(P<0.05)。结果表明,相对于20周龄,55周龄固始鸡脂肪沉积显著增加。

In order to comparing the skeletal muscle characteristics of young and old hens,this paper studied the difference Gushi hens at 20 and 55 weeks of age by detecting carcass traits,meat quality,amino acid content,fatty acid content and muscle fiber characteristics. The live weight, slaughter weight and width of intermuseular fat band of Gushi hens at 55 weeks of age were significantly higher than that at 20 weeks of age （P〈O.05）,percentage of half eviscerated yield and percentage of eviscerated yield of Gushi hens at 55 weeks of age were significantly lower than those at 20 weeks of age（P〈0.05）. For the breast muscle of Gushi hens,leucine content at 55 weeks of age was significantly lower than that at 20 weeks of age,intramuscular fat content and oleic acid content were significantly higher than those at 20 weeks of age （P〈0.05）. For the leg muscle of Gushi hens,the diameter of muscle fiber at 55 weeks of age was significantly higher than that at 20 weeks of age,the density of muscle fiber at 55 weeks of age was significantly lower than that at 20 weeks of age （P〈0.05）. Other meat quality indexes were not significantly different between these two groups （P〉0.05）. It＇s suggested that the fat deposition at 55 weeks of age was significantly higher than that at 20 weeks of age.