| This experiment was designed to study the effect of dietary electrolyte balance(DEB) oncage-rearing Jin-ding ducks being in the period of 17-22 weeks. There were 216 Jin-ding ducksassigned to six groups randomly with three replicates of 12 ducks per replicate in the process ofthe experiment. Specifically, each group was fed with diets of 50,150,200,250,300,350 mmol/kgDEB respectively, which took six weeks. The method of single-factor analysis in SAS6.12 wasemployed to analyze the experiment data; in the meantime, the possible consequences of rearingexperiment, egg shell quality, metabolic trial, and blood acid-alkali indexes were discussed interms of the data. The consequence of rearing experiment suggested that the groups of DEB250 and DEB300had an earlier egg-laying maturity age (laying rate 50%) than others during the stage from 17 to22 weeks. The age of egg-laying maturity in the group of DEB250 was significantly differentfrom others except DEB300 (P>0.05). The group of DEB250 had the highest laying rate, but nosignificant difference from the group of DEB300 (P>0.05). The rate of egg production in groupsof both DEB250 and DEB300 was higher than others (P<0.05). In particular, the group ofDEB50 was the lowest while the group of DEB250 was the highest. The average weight of eggsin the group of DEB250 was the highest; it was the lowest in the group of DEB50. In addition,the average egg weight in the groups of both DEB250 and DEB300 was significantly higher thanthat in the groups of DEB50, DEB150, and DEB350. The group of DEB50 shown the highestbroken egg rate had a big difference from other groups (P<0.05). However, the difference amongthe groups left was not very obvious. The lowest broken egg rate rose in the group of DEB350.During the experiment, the feed conversion rate was the highest in the group of DEB300 while itwas the lowest in the group of DEB50. Meanwhile, the feed conversion rate in the groups ofDEB250 and DEB300 was significantly higher than that in other groups (P<0.05). The consequence of egg shell quality suggested that the effect of the DEB level on thethickness and intensity of egg shell was not different from each other (P>0.05). However, withthe improvement of the DEB level, the thickness and intensity of egg shell were increased, forexample, the weight of egg shell in the groups of DEB250 and DEB300 was significantly higherthan that in the groups of DEB50 and DEB150 (P<0.05). ~ VI ~Abstract The consequence of metabolic experiment showed that the retention of nitrogen being thehighest in the groups of DEB250 and the lowest in the group of DEB50 was not different fromeach other (P>0.05). However, with the enhancement of the DEB level, there was a tendency ofgoing up first and then down. The availability of Ca, K, Mg and Fe had no significant differenceamong all groups. Particularly, the availability of P in the group of DEB350 was the highest andit differed from those in the group of DEB350 (P<0.05). However there was no significantdifference among other groups (P>0.05). The availability of Na+ increased with the improvementof the DEB level, in addition to such phenomenon, there was significant difference among allgroups (P<0.05). The meausure trial of serum indexes indicated that the density of Na+ in serum in the groupof DEB350 was significant higher than that in others (P<0.05); the density of C1- in the group ofDEB50 was significant higher than that in the groups of DEB300 and DEB200 (P<0.05); thedensity of K+, Ca2+and Mg2+ was not significantly different (P>005); the density of HCO- andPH increased with the improvement of DEB level, at the same time, the density of HCO3- andPH in the group of DEB 350 was significantly higher than that in the group of DEB50 (P<0.05). Master Candidate:Zheng Shifeng Major:Animal Nutrition and F...
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