高原反刍家畜Ca、P代谢

Ca and P metabolism of ruminants under the altitude environment

西藏农区反刍家畜体格较小,不及内地牛、羊体质量的1/2。对牛、羊各主要物质代谢进行了测定分析后,发现P的沉积量较少,仅为(0.090 1±0.075 0)g/W0.75.d。因海拔高度的升高,引起的血液TCO2和血液CaO2的量降低。采用理论与实际测试相结合,总结出各值与大气压的关系,即,TCO2(mmol/L)=0.01×CO2结合力(CO2CP)(mmol/L)×大气压(kPa);CaO2(mL/dL)=0.002 7×大气压+1.366 8×Hb(g/dL)-1.386 9×Hb(g/dL)×exp(-0.043×大气压);尿P(mg/d)=血磷阈值(mmol/L)×正常TCO2(mmol/L)-高原TCO2(mmol/L)×95%×31(P原子量)×17.37%×每天尿量(0.069 3×W0.75)/正常TCO2(mmol/L),并对各式进行了理论阐述。此式能较合理地反映高原环境下反刍家畜Ca、P的代谢状态。

The body weight of ruminants was inferior to half as interior ones in Tibet agriculture regions.The results showed that the sediment yield of phosphates was less per day by the main metabolic indicators.The relationship between TCO2,CaO2,urinary P and atmospheric pressure were calculated with combining theory with practice as the low TCO2,CaO2 when the rising of altitude.The relationship was,TCO2（mmol/L）=0.01×CO2CP（mmol/L）×atmospheric pressure（kPa）;CaO2（mL/dL）= 0.0027×atmospheric pressure（kPa） ＋1.366 8×Hb（g/dL）-1.386 9×Hb（g/dL）× exp（-0.043×atmospheric pressure）;Urinary P（mg/perday）= threshold value of blood P（mmol/L）×normal value TCO2（mmol/L）-platae TCO2（mmol/L）×95%）×31（P atomic weight）×17.37%×urinary volume（0.069 3×W0.75）/ normal value TCO2（mmol/L）.Each computational formula was elaborated in the paper.The relations reflected reasonable metabolic characteristics on Ca,P of ruminants under the altitude environment.