Effect Of Supplement Feed Amount On HeBei Chai Hen's Production Performance And Egg Quality

It is one kind of green production mode that the laying hens is feed on mountain .The egg texture that feed on mountain is fine, flavor is tasty ,and it is rich to nourish .Belong to the nourish and green food .The market price is 3~5 times of the ordinary egg. When feed hens on mountain, suitably to supplement feed may lift the production efficiency ,economic benefit and improvement egg quality. This experiment researched the effect of difference supplement feed amount on the Chai laying-hen's production performance , lipid metabolism and anti-oxidation status. Those provide the academic and practical basis for the application of green food using in poultry production.480 two hundred and forty -day-old Chai laying-hens were randomized into 4 treatments, with three replications per treatment. The control hens were feed basal diet consisting of a corn-soybean -mixed meal, trial I : 60% basal diet; trial II: 40% basal diet; trial III: liberty basal diet. Liberty feed grass in every trial. Egg laying rate and feed consumption were noted during the experiment; egg samples and serum samples were collected from replications to determine at the finally of experiment. The results showed as follows:(1) Supplemented feed amount diet affected the producing performance of Chai laying-hens, Compared to control, the producing rate were very significant decreased (p<0.01)in the 60% and 40% supplemented feed group, and egg weight was higher decreased (P<0.05),the producing rate and egg weight of the liberty basal diet + grass treatment was not remarkbly changing(p>0.05),moreover the laying rate possessed of enhance tendency. Decrease the supplemented feed amount could cut down the anticipates of the feed/egg ratio, and lift economic benefit, The liberty basal diet + grass treatment was the highest economic benefit. The 40% supplemented feed treatment was the lowestfeed/egg ratio.(2)Decrease supplement feed amount could improve the quantity of egg,40% supplement feed could increase RYCF exceedingly remarkbly (p<0.01), remarkbly increase yolk ratio(p<0.05), and decrease albumen ratio(p<0.05), Yet the Ha-Fu unit remarkbly cuts down (p<0.05) .(3)After decrease supplement feed amount to the laying hens, the lipid metabolism was ameliorated. In the end of the experiment, the serum triglyceride (TG) ,serumcholesterol(TC) and yolk cholesterol of all treatments was decreased, and the high density lipoprotein cholesterol(HDL-C) was increased. To the lever of serum triglyceride(TG),the difference between 40% supplement feed group and control group were very significant(p<0.01),and 60% supplement feed group too, the differences between the liberty basal diet + grass group and control group were significant (p<0.05). The lever of serum cholesterol (TC) was significant decreased in every trial groups(p<0.05). The lever of 40% supplement feed group's high density lipoprotein cholesterol(HDL-C) was very significant increased (p<0.01), 60% supplement feed group and liberty basal diet + grass group were significant increased (p<0.05). yolk total cholesterol(TC) was decreased, the difference between each trial group and control group was significant(p<0.05), the differences among the trial groups were not significant(p>0.05).(4)Decrease supple Carotenoids ment feed amount to the laying hens, the level of vitamin E in the serum and the carotenqids in the the yolk could be increased, the anti-oxidation was improved. The super oxide disrnutase(SOD) activity in serum of trial groups were elevation, serum and yolk malondialdehyde(MDA) concentration were decreased. In the end of the experiment, The lever of serum MDA difference between 40% supplement feed group and control group was very significant(p<0.01), and 60% supplement feed group too, the difference between the liberty basal diet + grass group and control group was significant(p<0.05). The lever of yolk MDA difference between 40% supplement feed group and control group was very significant(p<0.01), the differences between the 60% supplement feed group and control group was significant(...