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Three mature, whitefaced ewes were used to study the responses to purified porcine LH-RH at various stages of the estrous cycle. The estrus activity of the ewes was checked twice daily with a vasectomized ram. Each ewe received 3 µg LH-RH dissolved in 5 ml saline intracarotidly. Venous blood samples were collected prior to and after administration of LH-RH. Serum LH levels in the samples were quantitated by a double antibody radioimmunoassay. The present experiments show that after administration of LH-RH an elevation of serum LH occurs at all stages of the estrous cycle. The same dose of LH-RH induced a greater change in serum LH during an 8±4-hr. period on day 1 than at any other stage of the estrous cycle. Thus, present evidence indicates that pituitary responsiveness to LH-RH at estrus is considerably greater than at other stages of the estrous cycle, and may be an important factor in the preovulatory surge of LH.
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Reeves et al. (1971) studied this question.
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