Effect Of Natural And Synthetic Vitamine E On Performance And Reproduction Performance On Laying Hens

The first experiment:in order to evaluate the effects of different dietary levels of natural and synthetic Vitamin E on the performance, antioxidant ability and egg quality on the laying hens,540ISA brown layer (210days old) were divided into3treatments fed with basal diets containing synthetic VE15IU/kg, natural VE9IU/kg and natural VE15IU/kg. The results showed that there was a higher performance was observed in layer fed with natural VE15IU/kg, and an enhanced SOD activities and reduced MDA concentrations were also found in this group. In addition, the diets supply with natural VE15IU/kg could improve egg quality.The second experiment:in order to evaluate the effects of different dietary levels of natural and synthetic Vitamin E on the performance, reproduction performance on the laying hens,540ISA brown layer (380days old) were divided into3treatments fed with basal diets containing synthetic VE15IU/kg, natural VE9IU/kg and natural VE15IU/kg. The results showed that:when the environment temperature is high(30-35℃), there was a higher laying rate and average egg weight was observed in layer fed with natural VE. In addition, the diets supply with natural VE could improve activity of reproductive hormone in serum.The third experiment:This experiment was designed to study the differences of VE deposition in serum, yolk and tissues between added natural and synthetical VE in the diet of layers. The results showed as follows:1The concentration of VE in the serum of the2and3group were higher than the control group in the30d (P<0.05),60d and90d, but the concentration of MDA was lower (P>0.05).2The concentration of VE in the yolk of the2and3(P<0.05) group were higher than the control group in the30d,60d and90d, but the the concentration of MDA was lower (P>0.05).3The concentration of VE in the liver of the2group was higher than the others. The concentration of VE in the muscle of the3group was the highest. The results indicated that added natrual VE in the diet of layers can improve the deposition of VE in the serum, yolk and tissues, and the group adding15IU/kg natrual VE expresses better results than the group which added9IU/kg natrual VE.