J. Anim Sci.
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J. Anim Sci. 1970. 30:774-776.
© 1970 American Society of Animal Science
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Thyroxine Administration and Reproduction in Rats1

A. B. Schultze and J. Noonan

University of Nebraska,2 Lincoln

Abstract

Appropriate dosages of thyroxine increased uterine metabolism at the proestrus stage of the cycle in female rats with ovaries intact, but decreased the uterine metabolism induced by estradiol administration in spayed females. Thirty micrograms l-thyroxine administered daily for 6 days prior to breeding and discontinued at the time of breeding increased ovulation rate, implantation rate and litter size.

Footnotes

1 Published with the approval of the Director as Paper No. 2619, Journal Series, Nebraska Agricultural Experiment Station.

2 Department of Animal Science.






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Copyright © 1970 by the American Society of Animal Science.