日粮蛋白质水平对鹅生长性能及肉质的影响

选取28日龄、体重相近的合浦灰鹅60只,随机分为3个组,采用精料 青料(黑麦草等)混合的方式进行饲喂试验,试验期为42天。第70d采血测定血清中尿素氮、转氨酶活性、血脂和脂蛋白等生化指标,并进行屠宰测定和肌肉营养成分含量测定。试验结果表明:(1)生长前期(28~49日龄),第2组日增重较高,各组间差异不显著(P>0.05);生长后期(50~70日龄)第1组日增重较高,各组间差异不显著(P>0.05)。(2)鹅的血清尿素氮含量随饲粮粗蛋白质水平的降低而下降(P<0.05);血清转氨酶活性、脂类和脂蛋白含量等组间无显著差异。(3)饲粮粗蛋白质水平对肉鹅屠宰性能无显著影响,鹅肉中的干物质、粗蛋白质、氨基酸总量、必需氨基酸总量、肌内脂肪、肌苷酸含量与蛋白质有正相关,各组间差异不显著(P>0.05),随着蛋白质水平提高,肌肉的营养和风味有改善的趋势。

Effects of Different Dietary Crude Protein on Geese Performance and Carcass Quality

In feeding trial,sixty 28d old geese were randomly divided into 3 groups,and at the same time,green forage (such as ryegrass) was supplied.Feeding trial lasted 42d.The results showed:(1)In period of 28~49d old,geese of group 2 had better daily gain than those of group 1 or group 3, but there were no significant differences among 3 groups (P>0.05);(2)In period of 50~70d old,although geese of group 1 had better daily gain than those of group 2 or group 3,there were no significant differences among 3 groups (P>0.05);(3)Concentration of serum urea-nitrogen decreased with CP decreasing in diets (P<0.05),and there were no significant differences in the content of serum cholesterol,triglycerides,low-density lipoprotein,high-density lipoprotein and activities of alanine aminotransferase(ALT), aspartate aminotransferase(AST) among 3 groups.(4) Dietary CP level had no significant effect on slaughter performance and carcass quality of Hepu meat-type geese (P>0.05).(5) The nutrients in muscle indicated that DM,CP,TAA,TEAA,EE and inosinate were not different significantly among 3 treatments (P>0.05).But with dietary CP level increasing, nutrition and flavor of meat were slightly improved.