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Biology of Reproduction, Vol 1, 228-233, Copyright © 1969 by Society for the Study of Reproduction

Progesterone and Luteinizing Hormone Secretion during Luteal Inhibition by Exogenous Oxytocint

P. G. HARMS 1, G. D. NISWENDER 2, , and P. V. MALVEN 3

1 Department of Animal Sciences, Purdue University, Lafayette, Indiana 47907
2 Department of Pathology, University of Michigan, Ann Arbor, Michigan 48104
3 Department of Animal Sciences, Purdue University


The concentrations of LH and of progesterone were determined in blood plasma coliected on days 2, 3, 4, 5, 7, and 9 of the estrous cycle in four nontreated and four oxytocin-treated heifers. LH was quantitated by radioimmunoassay and progesterone was determined by competitive protein-binding assay. Exogenous oxytocin did not significantly affect the concentration of LH during the luteal phase of the estrous cycle but it did cause a precocious return to estrus during which high levels of LH were found. The concentration of progesterone was not affected by oxytocin treatment until Day 5 of the estrous cycle at which time a significant (p < .01) decrease was noted. Most correlation coefficients between LH and progesterone concentrations were not significant; two exceptions were the significant (p < .05) correlations between plasma LH on Day 3 and plasma progesterone on Days 3 and 4.

Submitted on February 10, 1969






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Copyright © 1969 by the Society for the Study of Reproduction.