Effect Of DEB On Performance Of Cage-Rearing Ducks Of Laying In High Temperature

The experiment was conducted to study the requirements of DEB for cage-feeding Jin-ding ducks from 18-23 weeks. In the experiment, the 216 Jin-ding ducks of commercial strain (18 weeks of ages) were assigned to six groups randomly with six replicates of six ducks per group. Each group was fed with DEB 100mmol/kg, 200mmol/kg, 250mmol/kg, 300mmol/kg, 350mmol/kg, 400mmol/kg respectively, randomly arrangements. The experiment last eight weeks long, and the temperature was controlled at 32±2℃, and the humidity was 65%.The results of rearing experiment showed that in the stage from eighteen to twenty-three weeks, there was significant effect on the laying rate, the feed conversion rate , the average weight of eggs and the broken egg rate (p<0.05).The group of DEB350 had the highest laying rate,the feed conversion rate and the rate of egg production,while the group of DEB350 had the lowest broken egg rate .The trial of serum biochemical indexes indicated that there was significant effect on CO2, PH,GLU, Na+, K+, Cl-, Na++K+-Cl- and some enzymes,namely,ALT,ALP,UR,AG and OSM(p<0.05),and there was significant no effect on Ca2+,AST,GLU,BUN,CR and B:C(p>0.05).The results of incretion trail revealed that there was significant effect on T(4p<0.05),and the group of DEB 350 was significantly lower than the group of DEB 100 and DEB 200(p<0.05).There was no significant on T3 and T4/ T3(p>0.05),while there was significant effect on E2 and Cort(p<0.05).