日粮硒水平对山羊全血谷胱甘肽过氧化物酶活性和组织硒含量的影响

实验考察了在舍饲条件下,饲喂混合精料和干草时补硒对断乳山羊全血谷胱甘肽过氧化物酶(GSH-Px)活性、组织硒含量及其它指标的影响。风干基础日粮含硒0.03ppm,各实验组的补硒量分别为0、0.05、0.10、0.20、0.30ppm。结果表明;日粮含硒0.23ppm试羊全期增重、饲料/增重最佳,但各组间差异不显著。补硒后试羊全血GSH-Px活性显著升高,日粮含硒量大于或等于0.23ppm时酶活呈平稳状态,全血GSH-Px活性是表示山羊硒营养状况的较好指标。组织含硒量随日粮硒水平增加而上升,血硒、肾硒含量在日粮含硒0.23ppm时上升程度增大。由此可见,断乳山羊风干日粮硒需要量约为0.23ppm。

EFFECT OF DIETARY SELENIUM LEVELS ON BLOOD GLUTATHIONE PEROXIDASE ACTIVITIES AND TISSUE SELENIUM CONCENTRATIONS IN KIDS

The confined feeding trial was conducted with kids fed concentrates and grass hay to determine effect of dietary supplemental selenium on blood glutathione peroxidase(GSH-Px)activities and tissue selenium concentrations.Kids were divided into five groups. Diets of air dry basis contained 0.03, 0.08, 0.13, 0.23, 0.33 ppm selenium, respectively. Body weight gain and feed/gain ratio at the 0.23 ppm dietary selenium was the best. However, no significant difference was observed among the five groups. Blood GSH-px activity increased with dietary selenium increment, and reached a plateau at approximate 0.23 ppm. This activity was a better criterion to estimate the selenium status of kids. Selenium concentrations of tissues increased as dietary selenium increased. Blood and kidney selenium concentrations at the 0.23 ppm dietary selenium increased more greatly than that at the 0.08 or 0.13 ppm. The result shows that dietary selenium requirement of kids is approximate 0.23 ppm in air dry diet.