杜仲叶粉对绿壳蛋鸡蛋品质、血清生化指标、屠宰性能及肉质性状的影响

本试验旨在探究饲粮中添加不同水平杜仲叶（EUL）粉对绿壳蛋鸡蛋品质、血清生化指标、屠宰性能以及肉质性状的影响。选择体重、产蛋率相近，健康状态良好的产蛋初期绿壳蛋鸡80只，随机分为4组，每组20只。各组分别饲喂添加0（CTL组）、2%（EUL1组）、4%（EUL2组）、6%（EUL3组）杜仲叶粉的玉米-豆粕型饲粮。预试期5 d，正试期70 d。饲喂试验结束后对各组鸡的蛋品质、血清生化指标、屠宰性能以及肉质性状进行测定。结果表明，饲粮中添加杜仲叶粉后，血清中甘油三酯（EUL1、EUL2和EUL3组）、葡萄糖（EUL2和EUL3组）和尿素（EUL2和EUL3组）与CTL组相比极显著降低（P<0.01）；各试验组蛋品质、屠宰性能与CTL组相比差异均不显著（P>0.05）；肝脏重（EUL1和EUL2组）和心脏重（EUL1、EUL2和EUL3组）与CTL组相比极显著降低（P<0.01）；腿肌蛋白（EUL1组）和胸肌脂肪（EUL2组）含量与CTL组相比显著提高（P<0.05）；腿肌pH_{24 h}（EUL2组）与CTL组相比显著提高（P<0.05）；腿肌剪切力（EUL2组）与CTL组相比极显著降低（P<0.01）。说明杜仲叶粉可显著降低血清中甘油三酯、葡萄糖、尿素的水平；不影响蛋品质，但能改善绿壳蛋鸡肌肉品质，提高胸肌脂肪、腿肌蛋白质含量和腿肌嫩度，显著降低鸡的肝脏重和心脏重。本试验中，杜仲叶粉在蛋鸡饲粮中的适宜添加水平为4%。

Effects of Eucommia ulmoides Leaves Powder on Egg Quality,Serum Biochemical Indexes,Slaughtering Performance and Meat Quality in Green-shell Layers

The experiment was conducted to study the effects of adding different levels of Eucommia ulmoides leaves (EUL) powder on egg quality,serum biochemical indexes,slaughter performance and meat quality of Green-shell layers.80 healthy Green-shell layers with the similar body weight,egg-production rates and good healthy conditions were randomly divided into 4 groups with each group 20 replicates and each replicate had 1 chicken.Each group was fed corn-soybean meal diet supplemented with 0% (CTL group),2% (EUL1 group),4% (EUL2),6% (EUL3) Eucommia ulmoides leaves meal.The trial period lasted for 5 d,the formal experiment period lasted for 70 d.The egg quality,serum biochemical indexes,slaughter performance and meat quality of each group of chickens were measured after the feeding test.The results showed as follows:Adding Eucommia ulmoides leaves powder into diets could significantly decreased the triglyceride (EUL1,EUL2,EUL3),glucose (EUL2,EUL3) and urea (EUL2,EUL3) in serum (P<0.01).There was no significant difference in egg quality and slaughter performance (P>0.05).Liver weight (EUL1,EUL2) and heart weight (EUL1,EUL2,EUL3) were significantly reduced (P<0.01).Thigh muscle protein (EUL1) and pectoral muscle fat (EUL2) content were significantly increased (P<0.05).The pH_{24 h} of the leg muscles (EUL2) was significantly increased (P<0.05).The shear force of the leg muscle (EUL1) was significantly reduced (P<0.01).In conclusion,Eucommia ulmoides leaves powder could significantly reduce the levels of triglyceride,glucose and urea in serum.There was no significantly difference in egg quality,but the muscle quality of Green-shell layers were improved,pectoral fat leg muscle protein content and leg muscle tenderness were increased,liver weight and heart weight were significantly reduced.In this experiment,the suitable adding level of Eucommia ulmoides leaves powder in layer feed was 4%.