J. Anim Sci.
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J. Anim Sci. 1969. 28:766-770.
© 1969 American Society of Animal Science
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Effect of Successive Enucleations of Bovine Corpora Lutea on Formation and Function of Subsequent Luteal Tissue1,2,

R. M. Purse and E. W. Wickersham3

The Pennsylvania State University, University Park

Abstract

Four nulliparous Holstein heifers were used in an experiment to determine the effect of endogenous luteal progesterone withdrawal, as achieved by successive enucleations of luteal tissue, oh the formation and functional activity of subsequent luteal tissue. Glands were enucleated from each heifer at four consecutive times on day 10 postestrus via a supravaginal incision.

Successive enucleation of luteal tissue at day 10 postestrus resulted generally in the formation of increasingly more cystic ovarian structures, progressing from normal corpora lutea to cystic corpora lutea to luteinized follicles associated with ovulation failure. However, the consecutive removal of luteal tissue had no significant effect on either the amount of luteal tissue formed or the functional activity of subsequent luteal tissue. A mechanism for the explanation of these results is discussed.

Footnotes

1 Authorized for publication as Paper No. 3470 in the Journal Series of the Pennsylvania Agricultural Experiment Station on September 3, 1968.

2 The data presented in this paper are from a thesis submitted by the senior author to the Graduate School of The Pennsylvania State University in partial fulfillment of the requirements for the Master of Science degree.

3 Department of Biology.






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Copyright © 1969 by the American Society of Animal Science.