陈化玉米对蛋鸡生产性能、消化与抗氧化功能及蛋品质的影响

Effects of Aging Corn on Performance,Digestive and Antioxidant Functions and Egg Quality of Laying Hens

本研究旨在探讨陈化玉米对蛋鸡生产性能、消化与抗氧化功能及蛋品质的影响。将288只60周龄海兰褐蛋鸡随机分为4组,每组6个重复,每个重复12只蛋鸡。试验用不同比例陈化玉米等量替代基础饲粮中的正常玉米,分别为以下4种饲粮处理:1)对照组:基础饲粮(正常玉米);2)25%陈化玉米组:25%陈化玉米等量替代基础饲粮中的正常玉米;3)50%陈化玉米组:50%陈化玉米等量替代基础饲粮中的正常玉米;4)100%陈化玉米组:100%陈化玉米等量替代基础饲粮中的正常玉米。预试期1周,正试期8周。结果表明:1)与对照组相比,100%陈化玉米组蛋鸡产蛋率显著降低(P<0.05)。2)与对照组相比,100%陈化玉米组蛋鸡血清葡萄糖(GLU)和白蛋白(ALB)含量显著降低(P<0.05),50%和100%陈化玉米组蛋鸡前肠食糜中胰蛋白酶活性显著降低(P<0.05)。3)与对照组相比,25%、50%、100%陈化玉米组蛋鸡的血清谷胱甘肽过氧化物酶(GSH-Px)活性均显著降低(P<0.05),100%陈化玉米组蛋鸡的血清丙二醛(MDA)含量显著升高(P<0.05)。与对照组相比,50%和100%陈化玉米组蛋鸡的肝脏GSH-Px活性显著降低(P<0.05),100%陈化玉米组蛋鸡的肝脏过氧化氢酶(CAT)活性显著降低(P<0.05),50%和100%组蛋鸡的肝脏MDA含量显著升高(P<0.05),100%陈化玉米组蛋鸡的肝脏蛋白质羰基(PC)含量显著升高(P<0.05)。4)与对照组相比,试验第56天100%陈化玉米组鸡蛋的蛋黄颜色显著降低(P<0.05)。由此可见,随着陈化玉米替代比例的增加,蛋鸡产蛋率有所下降,100%陈化玉米饲粮显著降低蛋鸡产蛋率,使蛋鸡血清GLU和ALB含量降低,影响前肠消化功能,导致血清和肝脏抗氧化功能下降,且对蛋黄颜色造成一定负面影响。

This study aimed to investigate the effects of aging corn on performance,digestive and antioxidant functions and egg quality of laying hens.A total of 288 Hy-Line laying hens(60-week of age)were randomly divided into 4 groups with 6 replicates per group and 12 hens per replicate.Aging corn replaced equivalent amount of normal corn used in the basal diet at various levels,and the four dietary treatments were as follows:1)control group:basal diet(normal corn);2)25%aging corn group:aging corn replaced equivalent amount of normal corn in the basal diet at a level of 25%;3)50%aging corn group:aging corn replaced equivalent amount of normal corn in the basal diet at a level of 50%;4)100%aging corn group:aging corn replaced equivalent amount of normal corn in the basal diet at a level of 100%.The pre-experimental period lasted for 1 week,and the experimental period lasted for 8 weeks.The results showed as follows:1)compared with the control group,the laying rate of 100%aging corn group was significantly decreased(P<0.05).2)Compared with the control group,the content of glucose(GLU)and albumin(ALB)in serum of laying hens of 100%aging corn group were significantly decreased(P<0.05),the activity of trypsin in anterior intestinal chyme of laying hens of 50%and 100%aging corn groups was significantly decreased(P<0.05).3)Compared with the control group,the serum glutathione peroxidase(GSH-Px)activity of laying hens of 25%,50%and 100%aging corn groups was significantly decreased(P<0.05),and the serum malondialdehyde(MDA)content of laying hens of 100%aging corn group was significantly increased(P<0.05).Compared with the control group,the liver GSH-Px activity of laying hens of 50%and 100%aging corn groups was significantly decreased(P<0.05),the liver catalase(CAT)activity of laying hens of 100%aging corn group was significantly decreased(P<0.05),the liver MDA content of laying hens of 50%and 100%aging corn groups was significantly increased(P<0.05),and the liver protein carbonyl(PC)content of laying hens of 100%aging corn group was significantly increased(P<0.05).4)Compared with the control group,the egg yolk color of 100%aging corn group on day 56 was significantly decreased(P<0.05).It is concluded that laying rate is decreased with the increasing proportions of aging corn,and 100%aging corn diet could significantly decrease the laying rate,reduce the contents of GLU and ALB in serum,affect the digestive function of anterior intestine,decrease the antioxidant function of serum and liver,and have a negative effect on yolk color.