Abstract: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.
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