Eight females were hysterectomized, three at 5 days, three at 10 days and two at 15 days after oestrus. Seven returned to oestrus at the expected times, 24 to 32 days after the preceding oestrus, and four of these had a subsequent oestrous cycle of normal length. The corpus luteum of hysterectomized animals killed at various stages of the first and second post-operative cycles was compared with that of control non-operated animals killed at similar stages of the cycle and no differences were found. It is concluded that hysterectomy was without effect on the ovarian cycle of the brush possum.
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