Effects Of The Amino-Ethylsulfonic Acid On Growing Layer Cage-rearing Ducks

The experiment was conducted to study the effects of different taurine levels on anti-oxidative ability in egg-type ducks. A total of180Jin-ding ducks were randomly assigned to five dietary treatments with6replicates and each replicate contained6ducks.All the egg-ducks were fed com-soybean meal basal diets without fish meal supplemented with0%,0.05％,0.1％,0.15%and0.2%taurine respectively. Experimental period was six weeks.Growth and development: the results showed as follows:supplementation of0.10%taurine significantly improved average daily intake,and reduced the ratio of feed to gain (F/G) of egg-type ducklings (P<0.05), but there was no significantly effect on the daily intake(P>0.05)； Supplementation of taurine significantly improved lenghth of fallopian tube of ducks in the group Ⅱ,Ⅲ and Ⅳ(P<0.05)；compared with the control group, the index of fallopian tube weight was significantly increased in groupⅢ(P<0.05)；compared with the control group, the index of ovaries weight was significantly increased in groupⅢ and IV(P<0.05)；the level of estradiol (E2), luteotrop(h)ic hormone (LH) follicle-stimulating hormone (FSH) in serum were differently effected by the supplementation of taurine, but there was no significantly difference compared with the control group (P>0.05).Antioxygen function:the results showed as follows, compared with the control group, the group adding with0.15％taurine, the activities of glutathion peroxidase (GSH-Px), superoxide dismutase (SOD),totalanti-oxidation capability (T-AOC) were increased significantly (P<0.05), and decreased malondialdehyde (MDA) content in serum (P<0.05).But there is no significant effect between the0.15%and0.2%group. The group adding with0.I％and0.15%taurine, the activities of GSH-PX, SOD, CAT, T AOC were increased significantly(P<0.05), and decreased MDA content in liver(P<0.05).Blood biochemical and metabolism indicater: Blood uninary nitrogen(BUN), lactate dehydrogenase(LDH)and alkali phosphatase(ALP)in serum were the tendency of first increasement and then decrease with the increase of taurine supplementation, but there were no sinificant difference between the trial and control group(P>0.05) compared with the control group, the activity of ALP in serum was significantly difference(P<0.05). The effect of taurine to the the blood Copula Ⅲ and N were sinificantly lower than the control group(P<0.05)the contents of glucose (GLU) in group Ⅲ and N were sinificantly difference compared with the control group (P<0.05).Immunnization and hormone: the thymus index of ducks in trial group were sinificantly increased compared with the control group (P<0.05).The bursas of Fabricius index of ducks in trial group were no sinificantly difference compared with the control group (P>0.05). spleen index were sinificantly increased in group Ⅲ and Ⅳ(P<0.05). the total protein (TP) in group Ⅲ was significantly difference compared with the control group (PO.05). the albumin (ALB) in all group added with taurine were significantly difference compared with the control group (P<0.05). Along with the level increase added to the diet, contents of IgA and IgG in serum showed the tendency of first increase and then decrease, but there were no significanty difference compared with the control group(P>0.05). IgM in group Ⅲ in serum increased24.27%, compared with the control group. Contenst of T3in group Ⅲ was significantly increased compared with the control(P<0.05). Contenst of T4in group Hand Ⅲ was significantly increased compared with the control(P<0.05). Contenst of GH in group Ⅲ and IV were significantly increased compared with the control (P<0.05).In conclusion, supplementation with0.1%~0.15%tautine could improve the anti-oxidative ability of prophase of egg-laying ducks.