Study And Investigation On The Level Of Zinc In The Different Pig Farms Of Shanghai Suburbs

Zinc is one of the most important microelement for animal growth,which plays an important part of many kinds of usage in physiologicalrequirements. For this reason, some pig farms use overlord measure Zincfor piglet feed, which caused Zinc overproof in feed, pig excrement, soilaround pig farm, and led to environmental pollution. In this study, wetook an investigation in28different pig farms in Shanghai suburbs andgave a Zinc measure test in pig feed, pig excrement and soil around pigfarm.In the study of testing Zinc measure of pig feed, using the method ofatomic absorption spectrometry (AAS), we measured and analyzed thelevels of microelement zinc in feed in28different areas pig farms ofShanghai suburbs.Refer to the Shanghai local standard:" the Safety and QualityRequirements of Swine Poultry Feed Product "(DB35/562-2008), wemeasured108copies of feed samples, and the results showed that: therewere38copies of feed samples exceed the standard, the over-limit ratiowas35.9%.The discrepancies of over-limit ratio exist between differentscale pig farms and different types of feed, the most severe pollution ofwhich were small-scale pig farms and growing pigs feed, and nursery pigand piglet feed were normal.In the study of testing Zinc measure of pig excrement and the soilaround pig farm, using the method of atomic absorption spectrometry. Wetest Zinc measure in different parts of Shanghai8-scale pig farms in28different dung and surrounding soil for the determination of traceelements Zn and analysis. The results showed that69stool samples testedby reference to GB8172-87standards for urban wastes for agriculturalcontrol,54samples exceeded, the standard rate of78.26%of the totaldetection volume shows that different parts of Shanghai the different sizeof farms superscalar in serious condition. Detection of17pig farms in thesurrounding soil samples, refer to GB15618-1995standard three soilenvironmental quality standards, the situation does not appear excessive,indicating the scale of pig farms in different parts of Shanghai City, the soil around Zn pollution is minimal.In this paper，some problem were all be discussed， which was theZnic pollution. in the environmental of pig farms，the condition of Znicusage in nowadays animal husbandry. In this paper, the concept ofrecycling economy, the coordinating relationship between recycleeconomy, environment and development of animal husbandryenvironment were explained, some sustainable development model forcontrolling pollution of breeding also be proposed and discussed.