Effects of Capsaicin Supplementation on Production Performance,Egg Quality,Follicle Development and Reproductive Hormones of Changshun Green-shell Laying Hen at the Late Laying Period
[Objective]This study was aimed to investigate the effects of different levels of capsaicin(CAP)supplementation on production performance,egg quality,follicle development and reproductive hormones of Changshun Green-shell laying hens at the late laying period,and estimate the appropriate dose of CAP in diet of laying hens.[Method]Five hundred Changshun Green-shell laying hens(56 weeks of age)were chose and randomly allocated into 5 treatments,containing 10 replicates per treatment and 10 hens per replicate.Hens in group Ⅰ were supplied with the basal diet,and those in groups Ⅱ,m,Ⅳ and Ⅴ were separately fed with diets containing 100,150,200 and 400 mg/kg CAP based on the basal diet.The experimental period was 8 weeks.At the end of the experiment,the production performance and egg quality of hens were determined,the blood and ovarian tissue were collected to determine the levels of reproductive hormones and the indicators of reproductive organ development.[Result]Compared with group Ⅰ,①The laying rate and egg mass of hens in groups Ⅱ-Ⅴ were significantly increased at 1-4,5-8 and 1-8 weeks of the experimental period(P＜0.05).The average daily feed intake of hens at 1-4 and 5-8 weeks of the experimental period were significantly increased(P＜0.05).② The yolk color of eggs in groups Ⅱ-Ⅴ was significantly enhanced at the 4th week of the experimental period,while at the 8th week of the experimental period,the yolk color of eggs was significantly improved only in groups Ⅱ and Ⅲ(P＜0.05).Besides,the Haugh unit of eggs in group Ⅱ was significantly improved at the 4th and 8th week of the experimental period(P＜0.05).In addition,the Haugh unit of eggs in group Ⅲ was significantly improved at the 4th week of the experimental period(P＜0.05).③The relative weights of ovarium,large yellow follicles and small yellow follicles of hens in groups Ⅱ-Ⅴ were significantly increased(P＜0.05).Moreover,the number of small yellow follicles,and the contents of follicle-stimulating hormone,luteinizing hormone,progesterone and estradiol-17 β in serum of hens in groups Ⅱ-Ⅳ were significantly increased(P＜0.05).[Conclusion]Taken together,dietary CAP supplementation contributed to improving the production performance and egg quality,promoting follicle development and increasing the levels of productive hormone in Changshun Green-shell laying hens at the late laying period,and the better addition dose was 242-281 mg/kg.
万方数据
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