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Biology of Reproduction, Vol 6, 270-276, Copyright © 1972 by Society for the Study of Reproduction

Corpus Luteum Response to 6-chloro Dgr6-17 acetoxyprogesterone and HCG in the Cow

E. L. VEENHUIZEN 1, J. F. WAGNER 1, , and L. V. TONKINSON 1

1 Eli Lilly and company, Greenfield, Indiana 46140


An in vivo-in vitro incubation system was used to evaluate the effects of 6-chloro Dgr6-l7 acetoxyprogesterone (CAP) and HCG on bovine corpus luteum (CL) growth and progesterone synthesis. Corpora lutea were removed from 15 heifers in three consecutive estrous cycles. Progesterone concentration and CL size were not affected by repeated CL removal. Variations in progesterone values for CLs within animals were similar to that between animals. Weight of corpora lutea formed after a CAP-synchronized estrus was equal to controls while progesterone concentration was increased. HCG, administered daily from Day 2 to Day 7 of the estrous cycle significantly (p < 0.01) increased CL size; however, these CLs were less responsive to in vitro HCG stimulation than control or CAP CLs. HCG given in single injections (1000 IU) on either Day 1 or 3 of an estrous cycle also significantly increased CL size. Progesterone concentration was not markedly altered in the larger CLs, but the total content of progesterone was significantly increased.

Submitted on February 2, 1971
Revised on June 6, 1971






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