Abstract
Intrauterine pressure (IUP) was recorded in nonlactating dairy cows using an intraluminal catheter with two micropressure transducers located 15 cm apart at the distal end. There was a significant increase (P < 0.05) in IUP following administration of xylazine and oxytocin at all four stages of the estrous cycle. The most significant increase in IUP occurred during proestrus for both drugs. The effect of pretreatment with adrenoceptor-blocking agents on IUP changes induced by xylazine and oxytoxin was evaluated. Alpha-1 adrenoceptor blockade (prazosin) had no effect on IUP following xylazine treatment. However, alpha-2 adrenoceptor blockade (yohimbine) resulted in a reduction (P < 0.05) in IUP compared to controls. Neither prazosin or yohimbine affected oxytocin-induced IUP.
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