Abstract
ABSTRACT At least half of one uterine horn is required for normal regression of the corpora lutea in the pseudopregnant hamster. Although removal of any portion of the uterus slightly increased the duration of pseudopregnancy, only unilateral hysterectomy or unilateral hysterectomy and removal of the contralateral ovary did so significantly (P < 0.05). The presence of a sterile horn did not influence foetal development in the contralateral horn. No differences were observed in corpus luteum size between the right and left ovaries of animals unilaterally hysterectomized or unilaterally pregnant. Normal oestrous cycle activity continued following transplantation of the ovaries to the cheek pouches and pseudopregnancies were of normal duration. It is concluded from these observations that the amount of uterine tissue is of greater importance in regulating luteal regression in the hamster than its anatomical relationship to the ovary.
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