J. Anim Sci.
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J. Anim Sci. 1969. 29:25-29.
© 1969 American Society of Animal Science
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Modification of Bovine Luteal Function by Exogenous Oxytocin and Progesterone1

P. G. Harms2 and P. V. Malven

Purdue University, Lafayette, Indiana3, ,4

Abstract

Estrous cycle length in heifers was reduced significantly (P<0.01) by the following treatments: oxytocin (150 units daily) injected on day 3 to 7 (9.4 days), progesterone (100 mg. daily) injected on days 1 to 3 (13.6 days) or on days 2 to 6 (16.5 days). Corpora lutea were removed on day 8 from heifers injected with oxytocin on days 3 to 7 or with progesterone on days 2 to 6. Oxytocin treatment significantly reduced CL weight, progesterone concentration and 20ß-ol concentration.

Progesterone treatment reduced CL weight significantly but did not affect the concentration or total content of progesterone or 20ß-ol.

Progesterone was injected in combination with oxytocin and CL were removed on day 8 of the estrous cycle. The CL from heifers receiving the combination did not differ significantly in weight or hormone concentration from those in heifers receiving only oxytocin. These results caused the rejection of the hypothesis that exogenous progesterone might prevent the depletion of pituitary LH caused by oxytocin and thereby decrease the amount of luteal inhibition.

Footnotes

1 Paper No. 3512, Purdue University Agricultural Experiment Station. Supported in part by funds provided by Regional Research project NE–41 and by grant HD 02423 from the U. S. Public Health Service.

2 David Ross Fellow, Purdue Research Foundation.

3 Department of Animal Sciences.

4 Appreciation is expressed to Dr. J. F. Fessler, Department of Veterinary Clinics,for assistance with the surgical procedures.






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Copyright © 1969 by the American Society of Animal Science.