ISSN:
0002-9106
Keywords:
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Medicine
Notes:
Pregnant hamsters consistently ovulated when injected with 20 IU of human chorionic gonadotropin (HCG). The induced ovulation rate from days 4-8 of pregnancy was comparable to that observed during the estrous cycle; however, starting at day 10, a marked increase occurred, culminating in a peak of 35 ova at day 12. Animals injected with HCG on day 16, the day before delivery, ovulated an average of 14.5 ova, although spontaneous postpartum ovulation does not occur in the hamster. The number of ovulations induced by HCG correlated with the varying number of antral follicles present during different stages of pregnancy.Unilaterally ovariectomized pregnant hamsters did not show a compensatory increase in induced ovulation rate in the remaining ovary.The induction of ovulation on days 4 or 10 of pregnancy did not interfere with embryonic development nor influence the time of parturition. Following parturition, the primary and induced corpora lutea regressed synchronously.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aja.1001210205
