膨化棉籽粕对蛋鸡生产性能、蛋品质及血清生化指标的影响

本试验旨在研究不同比例膨化棉籽粕替代豆粕对蛋鸡生产性能、蛋品质及血清生化指标的影响.选取40周龄海兰褐蛋鸡360羽,随机分成5组,每组4个重复,每个重复18羽.对照组饲喂玉米-豆粕型基础饲粮,试验1组用6％普通未膨化棉籽粕替代豆粕,试验2、3、4组分别用6％、8％、10％的膨化棉籽粕替代豆粕,试验期8周.结果表明:1)饲粮中不同比例膨化棉籽粕对蛋鸡生产性能影响不显著(P＞0.05),而试验1组产蛋率和平均蛋重显著低于对照组(P＜0.05),料蛋比显著高于对照组(P＜0.05).2)与对照组相比,各试验组蛋黄颜色均显著加深(P＜0.05),而试验1、4组蛋白高度显著降低(P＜0.05).饲粮添加棉籽粕对蛋壳强度和蛋壳厚度无显著影响(P＞0.05).3)试验1组总蛋白、钾含量均显著低于对照组(P＜0.05),谷丙转氨酶活性显著高于对照组和试验2组(P＜0.05),尿酸含量显著高于试验2组(P＜0.05);试验4组血清总钙含量显著低于对照组(P＜0.05).随着膨化棉籽粕添加量的增加,血清总蛋白、总钙和钾含量均逐步降低,谷丙转氨酶活性则逐步升高,呈现一定的剂量-效应关系.饲粮添加棉籽粕对血清白蛋白含量无显著影响(P＞0.05).由此可见,蛋鸡饲粮中添加8％膨化棉籽粕对蛋鸡生产性能、蛋品质及血清生化指标无明显影响.棉籽粕膨化处理能有效降低游离棉酚对蛋鸡生产性能和蛋品质等的影响,提高蛋鸡对棉籽粕的利用能力.

Expanded Cottonseed Meal Affects Performance,Egg Quality and Serum Biochemical Indices of Laying Hens

This experiment was conducted to study the effects of expanded cottonseed meal on performance,egg quality and serum biochemical indices of laying hens.Three hundred and sixty Hy-Line laying hens,40 weeks old,were randomly divided into 5 groups with 4 replicates per group and 18 hens per replicate.The control group was fed a corn-soybean meal basal diet,trial group 1 was used 6% cottonseed meal instead of soybean meal of the control group diet,and trial groups 2,3,4 were used 6%,8% and 10% expanded cottonseed meal instead of soybean meal,respectively.The experiment lasted for 8 weeks.The results showed as follows: 1) different dietary expanded cottonseed had no significant effect on the performance of laying hens(P>0.05).Compared with the control group,laying rate and average egg weight in trial group 1 were significantly decreased(P<0.05),and feed-egg ratio was significantly increased(P<0.05).2) Dietary cottonseed meal had significant influence on yolk color(P<0.05),but the shell strength and shell thickness were no significantly affected(P>0.05).Albumen height in trial groups 1 and 4 was significantly decreased than that in control group(P<0.05).3) The contents of total protein(TP) and potassium(K) in trial group 1 were significantly lower than those in control group(P<0.05),but the glutamic pyruvic transaminase(GPT) activity was significantly higher than that in control group(P<0.05),the uric acid(UA) content was significantly higher than that in trial group 2(P<0.05).The serum calcium(Ca) content in trial group 4 was significantly lower than that in control group(P<0.05).The contents of TP,Ca and K were decreased with the dietary expanded cottonseed meal levels increasing,but GPT activity was increased,which showed a dose effect.But dietary cottonseed had no significant influence on albumin(ALB) content(P>0.05).In conclusion,diets with 8% expanded cottonseed meal have no negative effect on performance,egg quality and serum biochemical indices of laying hens.Expanding treatment can decrease the harm of free gossypol to laying hens,which can improve the efficiency of cottonseed meal utilization by laying hens.