Study On Sufficiency And Lack Of N,S,Ca,P Of "Soil-Grass-Livestock" Grazing Ecological Systemwith Different Seasons In Hainan Area Of Qinghai Province

With corporation between Lanzhou Institute of Animal Husbandry & Animal Medicine of Chinese Academy of Agriculture Science and Jiangxigou Breeding Farm of Qinghai Province Gonghe County , this article determined soil nutrients indexes,pasture nutrients indexes,grazing sheep rumen indexes,pasture and wool amino acid indexes and grazing livestock serum biochemistry indexes with different seasons,study sufficiency and lack of N,S,Ca,P of "soil-grass-livestock"grazing ecological,and come to scientific and credible conclusions : (1) The soil of this area is the faint alkaline calcareous soil,the contents of soil organic matter,organic carbon,total nitrogen and available sulfur are in abundance;the contents of total phosphorus in summer meadow soil is approaching to average level of countrywide soil,but soil of others seasons meadow are less than it;the contents of available phosphorus in spring-winter meadow soil are sufficient,the contents of summer are middling, but the contents of fall are lack;(2)The contents of Ca and S of pasture can suffice for grazing sheep in three seasons,but the contents of N and P are very lack , can not suffice for grazing sheep in spring-winter and fall, so the contents of pasture N and P are the important reasons to restrict production of grazing husbandry in this area;(3)The intake of grazing sheep in spring-winter and fall less than in summer,can not suffice for grazing sheep,especially grazing sheep can not intake sufficient nitrogen (crude protein) and phosphorus in spring-winter and fall,but the intake of grazing sheep in summer is enough;(4)The pH of grazing sheep rumen fluid is more than 7.0,the total nitrogen of rumen fluid in summer and fall are more than in spring,but the urea-nitrogen is less than in spring;(5)The contents of pasture amino acid in summer are more than in others seasons,but the contents are very limited,the contents of N,S,Cys and Met of sheep wool in 3 seasons are very lack , but the contents of N and Cys of goat wool are sufficient , the contents of S and Met are lack too;(6)The serum album and total protein of grazing livestock in summer and fall are in range of nature , but these serum indexes in spring-winter are less than natural range, the correlation between pasture N and serum album and total protein is very strong (r=0.813,0.788,0.826,0.769,P<0.01); the serum calcium and inorganic phosphorus level in 3 seasons are in range of natural , but the contents of serum AKP, HOP, BGP and CT in summer less than in spring and fall , these provided the born of grazing animal mobilized Ca and P to blood, so can maintain natural serum Ca and P level, but these grazing animal can not put up obvious clinical symptom , and the lack degree of P is more serious than Ca; (7)The correlation between pasture Ca, P and serum Ca, inorganic P is not strong (except Yak), but the correlation between pasture Ca, P and serum AKP, HOP, BGP, CT is strong. So we can use these serum biochemistry indexes reflect the born nutrition condition and calcium & phosphorus nutrition condition, and avoid husbandry productivity decreasing. In the end, the article advise this area must supply supplemental feeds in spring-winter and fall, and strength grazing manage especially supplement of protein and phosphorus, increase husbandry productivity in Hainan area of Qinghai Province.