Seasonal Changes And Sufficiency Or Lack Of Minerals Elements In The Soil-Forage-Animal Ecosystem In Haixi And Hainan Area In Qinghai Province

The two experiments were carried out to study the contents and their seasonal changes of macro-minerals (calcium and phosphorus) from soil, edible grass, serum and bone of one year old ram on the farm of chaka stud in haixi area of Qinghai province, and of trace minerals(Copper, molybdenum, manganese, zinc and selenium) from soil, edible grass, serum and hair of wethers on the farm of jiangxigou stud in hainan area of Qinghai province. The time of sampling were determined on the winter-spring(April to May), the summer July to August) and the autumn(October to November). The results from haixi area showed as follows: (1) The pH value of soil was above 8.0; the calcium carbonate in soil was sufficient while the whole phosphorus and the available phosphorus was deficient. (2) The concentration of calcium in edible grass was 8.08g/kg,and the daily grazing intake was 12.24g, the concentration of phosphorus was 1.56 g/kg and the daily grazing intake was 2.36g in summer, which was sufficient to ram. The concentration and daily feed intake of calcium and phosphorus was deficient in winter-sping and autumn. (3)The nutrition of calcium and phosphorus in ram-body in summer was in condition, while sub-health in winter-spring and autumn. The results from hainan area as follows: (1)The concentration of selenium in soil was from 0.06mg/kg to 0.12mg/kg,less than the lower limit(0.5mg/kg) and this areas was in the lack of selenium. (2)The concentration of Copper in edible grass in autumn was 3.77 mg/kg, the molybdenum in winter-spring was 0.309mg/kg, the average concentration of selenium from winter-spring to autumn in edible grass was 0.028mg/kg ,which was deficient; and the concentration of Manganese and Zinc was also lower than the requirement of wether. (3) The daily grazing intake of Copper, molybdenum and zinc was little or seriously less than the requirements of wether in autumn and winter-spring, and the daily feed selenium was not satisfied with the requirement of wether in three seasons. (4)The concentration of Copper and Molybdenum in serum came from grazing wether was normal or higher than the up-limit respectively, but that in the hair was lower than the normal value respectively. And the concentration of selenium in serum and hair was lower than their standard respectively, in the deficiency condition. (5)According to the results mentioned above, Copper, Molybdenum in grazing sheep was sub-health and that of Selenium was lack, And a suggest that a certain additive containing, Copper, Molybdenum and especially Selenium should be supplied for the sheep was putted forward.