Effects of different levels of quercetin on laying performance,egg quality,and lipid metabolism of laying hens
This experiment was conducted to study the effects of different levels of quercetin in diets on the laying performance,egg quality,and lipid metabolism of Hyline brown laying hens in late laying period,and to determine the optimal supplemental level of quercetin in laying hens.A total of 1 600 sixty-week-old healthy Hyline brown laying hens were randomly divided into four groups with four replicates per group and 100 laying hens per replicate.Hens in control group were fed a basal diet,and hens in experimental groups were fed diets supplemented with 200,400,and 800 mg/kg quercetin,respectively.The pre-test lasted for one week and the formal test lasted for 60 days.The results showed as follows:Compared with the control group,the laying rate of Hyline brown laying hens in all quercetin groups was significantly increased(P＜0.05),the egg weight and average daily egg weight of the test group 2 and group 3 were significantly increased(P＜0.05),and the ratio of feed to egg was significantly decreased(P＜0.05).Compared with the control group,the eggshell thickness and egg weight of the test group 2 and group 3 were significantly increased(P＜0.05),the eggshell strength and eggshell weight in the test group 2 were significantly increased(P＜0.05),and the yolk color and Haugh unit were significantly improved in all quercetin groups(P＜0.05).The crude protein content in yolk of the test group 2 and group 3 was significantly increased(P＜0.05),the cholesterol and triglyceride content in yolk of the test group 2 were significantly decreased(P＜0.05),and the phospholipid content in yolk of all quercetin groups was significantly increased(P＜0.05).Compared with the control group,the serum adiponectin content in the test group 2 and group 3 was significantly increased(P＜0.05),the serum leptin content in all quercetin groups was increased(P＜0.05),and the serum cholesterol,triglyceride,low density lipoprotein cholesterol,and glucose content in the test group 2 were significantly decreased(P＜0.05).The serum free fatty acid content in the test group 2 and group 3 was significantly decreased(P＜0.05).The results show that adding proper quercetin to the production of Hyline brown laying hens can improve the laying performance and egg quality,regulate the metabolism of blood lipids,and improve the body's health.The appropriate supplemental level of quercetin is 400 mg/kg.
quercetinlaying hensegg production performanceegg qualitylipid metabolism
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