Venous Catheterization of Dairy Cows

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Abstract
Polyvinyl chloride tubing was successfully used as a venous catheter for accurate injn. of radioactive p32 and for frequent bleeding over a long period with a min. of disturbance to cows. Nineteen catheters were used in 12 trials on 5 different cows. Blood was obtained at the rate of 1 ml./sec. through the catheters which remained open from 2.1 hrs. to 14.5 days. The technic of catheterization is descr.