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Biology of Reproduction, Vol 6, 131-135, Copyright © 1972 by Society for the Study of Reproduction

An Analysis of Preimplantation Embryonic Death in Senescent Golden Hamsters

THOMAS J. CONNORS 1, LARRY W. THORPE 1, , and A. L. SODERWALL 1

1 Department of Biology, University of Oregon, Eugene, Oregon 97403


Young (3-6 month) and senescent (13-16 month) pregnant golden hamsters were killed 56 and 132 hr after ovulation. Ovaries and oviducts were serially sectioned in the 56-hr group. The uterine horns were bleached and cleared in the 132-hr group.

Embryonic mortality occurred in two stages. The number of corpora lutea was the same in both groups (7.3 ± 0.14 corpora lutea per ovary in young, 6.8 ± 0.19 corpora lutea per ovary in old). The number of ova surviving in the oviducts at 56 hr had decreased significantly (p = < 0.01) to 4.9 ± 0.2 ova per oviduct in old animals compared with 6.6 ± 0.1 ova per oviduct in young.

The major source of embryonic mortality is failure of implantation in old animals. There were only 2.8 ± 1.5 implants per cornu in old hamsters and 6.1 ± 1.0 in young animals.

 Submitted on June 21, 1971






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Copyright © 1972 by the Society for the Study of Reproduction.