锌对青年牛生长发育的影响

EHects of Zinc on the Performance of Growing Heifers

将３０头青年牛随机等分为３组，在其日粮中添加０，１０．１及１９．９ｍｇ／ｋｇ的锌，使日粮中锌的含量分别达到８２．０，９１．６及１０１．２ｍｇ／ｋｇ。结果发现，３组牛的采食量、体尺指标、血液中钙及主要微量元素含量均无明显变化（Ｐ＞０．０５）。与含１０１．２ｍｇ／ｋｇ锌的日粮相比，日粮中含９１．６ｍｇ／ｋｇ锌时，日增重及饲料转化率分别提高３１．６％和３２．８％（Ｐ＜０．０５）

Thirty growing dairy heifers were randomly divided into three groups,0,10.1 and 19.9 mg/kg of zinc were added to the diets of each group respectively,whichmade up the total zinc contents for each group to 82.0,91.6 and 101.2mg/kg. The re-sults showed that there were no significant effects on the feed intake,body measure-ments,contents of calcium and trace elements in the blood among the experiment heifers(P>0.05).Compared with the diets with 19.9mg/kg of zinc,adding 10.1mg/kg ofzinc could increase the daily wieght gain and feed efficiency by 31.46%and 32.8%(P<0.05)respectively.