| Seasonal Changes in Forage Nutrients and Mineral Contents in Water Resources,Forage and Yak Blood |
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| 作者姓名： | 阎萍 Zh.Dejuan X.Xishan P.Heping Ch.Shengli |
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| 作者单位： | Y.Ping（Lanzhou Institute of Animal and Veterinary Pharmaceutical Sciences, Chinese Academy of Agriculture Sciences, Lanzhou 730050,Gansu,P.R. China）
Zh.Dejuan（Lanzhou Institute of Animal and Veterinary Pharmaceutical Sciences, Chinese Academy of Agriculture Sciences, Lanzhou 730050,Gansu,P.R. China）
X.Xishan（Lanzhou Institute of Animal and Veterinary Pharmaceutical Sciences, Chinese Academy of Agriculture Sciences, Lanzhou 730050,Gansu,P.R. China）
P.Heping（Food and Animal Science Department, Northwest Collage for Nationalities）
Ch.Shengli（Lanzhou Institute of Animal and Veterinary Pharmaceutical Sciences, Chinese Academy of Agriculture Sciences, Lanzhou 730050,Gansu,P.R. China） |
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| 摘 要： |
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Seasonal Changes in Forage Nutrients and Mineral Contents in Water Resources,Forage and Yak Blood |
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| Y.Ping,Zh.Dejuan,X.Xishan,P.Heping,Ch.Shengli.Seasonal Changes in Forage Nutrients and Mineral Contents in Water Resources,Forage and Yak Blood[J].China Herbivores,2005(Z2):209-210. |
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| Authors: | YPing ZhDejuan XXishan PHeping ChShengli |
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| Abstract: | This paper reports results of a study conducted to investigate the concentrations of seven mineral elements in yak blood, forage and water resources around the Qinghai Lake in Qinghai Province in different seasons. Meanwhile, the nutritional compositions of the forage were also surveyed. The results suggest that the mineral elements and the forage nutrients change in a seasonal pattern. In yak blood,the sodium(Na)concentration varies from 0.291 to 0.034 mg/mL,and this is lower than the normal value. In the forage,the ratio calcium(Ca)to phosphorus(P)is 4.06～7.47:1 and potassium(K)to Na 30～27:1. These results indicate that the nutrition of the yak in the area is deficient in Na but high in K. For the withered forage sampled in February,the protein content is only 31.14% of the total protein in the forage growing at puerile stage in June. The severe loss of protein by 68. 9% and decrease of effective nutrients in the wintered forage are considered to be the reasons resulting in the poor condition of yak in winter and spring seasons. |
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| Keywords: | Forage mineral elements nutrients water yak |
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