Effects Of Green Tea And Tea Polyphenols On The Meat Qualities, Egg Characteristic And Laying Performance Of Lohamann Hens

Nutrition regulation was a potential way to improve the muscle quality, egg quality and laying performance of Lohamann hens. The basal diets in this test were supplemented with the different levels of green tea and tea polyphenol (TP) to investigate the chicken qualities, egg qualities, and laying ability of Lohamann hens from earlier stage to fasigium during breeding. The differences among indexes were analyzed after green tea and tea polyphenol were added respectively. The results of this research would provide a reference for green tea and TP as feed addtivives after this investigation had been finished.1620 18-weeks-old Lohamann hens were divided into 9 groups randomLy, each group with 180 hens. CK as control group only fed a basal diet, green tea groupsⅠ,Ⅱ,ⅢandⅣfed a basal diet supplemented with 2000 mg/kg,4000 mg/kg,6000 mg/kg,8000 mg/kg green tea powders and TP groups fed a basal diet supplemented with 500 mg/kg,1000 mg/kg,1500 mg/kg,2000 mg/kg. The total experimental period was 84 days. Dietary effects of green tea powders and TP supplementation on the flesh qualities, egg qualitie and laying performance of laying hens were analyzed. The results are as follows:1. Effects of green tea and tea polyphenol on the muscle qualities of Lohamann hensComparison with control, the level of innosine monophosphate (IMP) in the breast and leg muscle of Lohamann hens were higher when different levels of green tea and TP were added to the the basal diet. The increase of IMP in breast flesh and leg flesh achieved the climax of 52.62% and 34.56% (P﹤0.05) respectively when the addition of green tea powders was 8000mg/kg; The rise of IMP in breast muscle and leg flesh achieved the climax of 43.16% and 35.66% (P﹤0.05) respectively when the addition of green tea powders was 1000mg/kg.The growth of Vitamin E reached the peak of 35.83% (P﹤0.05) in leg flesh when the addition of TP was 15000mg/kg. The total level of cholesterol (TCH) and triglyceride (TG) in breast and leg muscle all decreased on compared with the control when green tea and TP were added to the basal diet. For 22-weeks and 26-weeks Lohamann hens, the difference of TCH level in breast muscle for each groups was not significant (P﹤0.05) when compared with control. For 30-weeks Lohamann hens, the maximum reduction ratio of TCH and TG in breast muscle were respectively 9.93% and 22.58% (P﹤0.05) for the addition of 6000mg/kg green tea powders, and the significant decrease of TG in breast muscle was 7.53% for the addition of 1500mg/kg TP when compared with control. The difference of pH value in muscle was significant (P﹤0.01) while the water drip rate all decreased when green tea powders and TP were added into the basal diet. The difference of the fat and water in muscle were not notable (P﹥0.05).2. Effects of green tea and tea polyphenol on egg qualitieswhen the green tea and TP were added to the basal diet, the total TCH and TG of eggs for each groups were lower than those of CK. For the 24 weeks and 26 weeks Lohamann hens, the most significant reduction ratio of TCH in eggs was 6.68% for the addition of 6000mg/kg green tea powder and 7.37% for the addition of 1500mg/kg TP (P﹤0.05), respectively. As for 24-weeks Lohamann hens, the most significant reduction ratio of TG in eggs was 20.82%(P﹥0.05). The difference of the total the lecithin in eggs was not notable (P﹥0.05), but for the 24 weeks Lohamann hens was notable(P﹤0.05), and the protein contents, the ratio of the egg yolk and egg white, and eggs size also were not significant (P﹥0.05) when green tea and tea polyphenol were added into the basal diet.3. Effects of green tea and tea polyphenol on laying ferformance of Lohamann hensThe difference of laying rate of Lohamann was significant (P﹤0.01) when the green tea and TP added into the basal diet. The laying rate was 9.45% higher than that of CK for 30 weeks Lohamann hens when 6000mg/kg green tea powders and 1000mg/kg TP were fed. Comparision with control, the difference of ratio of feeds and eggs was significant (P﹤0.01) When the green tea and TP were added into the basal diet. As feeding time increased, the trend of ratio of feeds and eggs dropped firstly, and gradually reached the normal level while the difference of the average weight of eggs was not significent (P﹥0.05).