Analysis on blood physiological indexes and production performance of hypoxic adaptation of Xizang improved dairy cows
The study was to determine the blood physiological indexes and coagulation physiological indexes of Xizang improved dairy cows(Holstein × Xizang cattle)under hypoxia environment to reveal the blood physiological characteristics of hypoxia adaptation,and evaluate the improvement effect of Xizang improved dairy cows by regularly detecting their DHI indexes and tracking their milk yield.Improved cattle raised in a low-oxygen plateau environment(Qiongjie County,Shannan City,Xizang,3 617 m above sea level)were used as the research objects,and Holstein dairy cows introduced from Australia to Xizang and Xizang cattle(a local yellow cattle in Xizang)were selected as the control.Blood routine index,coagulation index,DHI index,and first fetal lactation yield were measured.The results showed that after long-term adaptation to low oxygen environment,the blood physiological indexes and DHI indexes of Xizang improved dairy cows had significant changes,among which HGB,HCT,and MCV were significantly higher than those of Xizang improved dairy cows and Xizang cattles(P＜0.05),and the PLT was significantly lower than that of Xizang improved dairy cows(P＜0.05).There were no significant differences in PT,APTT,and TT between Xizang improved dairy cows and Xizang cattles(P＞0.05),and the coagulation function was improved compared with that of Holstein cows.Compared with Xizang improved dairy cows,milk fat percentage,milk protein percentage and lactose were significantly increased(P＜0.05),while somatic cell count was significantly decreased(P＜0.05).The study indicates that the Xizang improved dairy cows have a certain ability to adapt to low oxygen,and can adapt to low oxygen environment better than the imported dairy cows.Compared with the Xizang cattle and the imported Holstein dairy cows,the production performance of the Xizang improved dairy cows was optimized and improved.
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