Effect Of Different Zinc Sources And Levels On Performance And Blood Physio-chemistry Indexes Of Weanling Pigs

A great quantity studies indicated daily ration adding 3000 mg·kg^-1 zinc(zinc oxide)could lessen diarrhoea improve growing of weanling pigs in 3 weeks after ablactation Butactual piglet daily ration zinc level applying have the trend increasing and feeds with aperiod also in extension, contaminating raising the dissipation and environment feedingwith a period having brought about zinc resource also in extension, have brought about zincresource dissipation and the environment contaminating. Tetrabasic zinc chloride alreadyhas applying in producing practice as new feed additive, but theory studies is few. ThisExperiment was conducted to investigate the most optimum zinc source and suitableaddition level on weanling pigs through feeding experiment and relative bloodphysio-chemistry indexes analysis experiment. 160 weanling pigs, which awerage weighwas 7.53 kg at 25 d of age, were randomly assigned to 5 groups(2×3 factorial), every groupcontaning four replication. Two sources (Zinc oxide and Tetrabasic zinc chloride) were addat 0 mg·kg^-1, 1200 mg·kg^-1, 2250 mg·kg^-1 to corn-soybean diets to study effect on theproduction performance at 40 d and 47 d of age. The mostly nutrient digestibility and thecontent of zinc in feces were studied based on the metabolism experiment for 3 d starting at38 d of age. A weanling pig in each replication was slaughtered to collect various tissuesand blood samples at 47 d of age, then serum physio-chemistry and the content of zinc intissue were determined in the laboratory. The results showed that:1. The group containing zinc oxide weanling pig had better effect on growth rate,feedconversion rate and diarrhea than tetrabasic zinc chloride supplemented groups, the level of1200 mg·kg^-1 and two weeks after Post-weaning has the good performance.2. The group containing zinc oxide weanling pig had better effect on digestibility ofcrude protein, ether extract, crude fiber and nitrogen free extract than tetrabasic zincchloride supplemented groups, but there were no singnificant difference(P＞0.05), then hadsignificantly higher on organic matter and dry matter digestibility than tetrabasic zincchloride supplemented groups (P＜0.05), the level of 1200 mg·kg^-1 has the goodperformance.3. The group containing tetrabasic zinc chloride had better effect on serumphysio-chemistry indexes than zinc oxide supplemented groups, the level of 1200 mg·kg^-1 has the good performance.4. The group containing tetrabasic zinc chloride had very significantly higher on thecontent of zinc in liver kidney heart and hair than zinc oxide supplemented groups(P＜0.01),had significantly higher on the content of zinc in pancreas than zinc oxide supplementedgroups(P＜0.05), had higher on the content of zinc in spleen and muscle than zinc oxidesupplemented groups, but there were no singnificant difference(P＞0.05). The zincconcentration in tissue increased with zinc supplementation.