Seasonal changes of mineral elements in yak blood,herbage and soil around Qinghai lake

摘要

Little information is available on the mineral nutrition of yaks(Bos Grunniens).Five mineral elements in herbage and soil were studied in the Qinghai lake area (Zhang et al,1997).The results showed that Copper and Zinc content in herbage was lower than standard, Manganese content was lower than standard in both herbage and soil, while Molybdenum content exceeded standard in herbage This study aimed to understand the present status of mineral elements in the main yak raising area around Qinghai lake, to provide some scientific basis for supplementation of mineral elements to yaks.