HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Ziecik, A. Articles by Williams, G. L. Search for Related Content PubMed PubMed Citation Articles by Ziecik, A. Articles by Williams, G. L.

Effect of Mating on the Luteinizing Hormone Surge in the Pig¹

North Dakota State University, Fargo 58105

³ Requests for reprints to Dept. of Anim. Sci.

Abstract

Twenty-eight cannulated crossbred gilts were assigned to one of four treatments: natural mating, artificial insemination (AI, whole semen), AI (seminal plasma) or control (nonmated). Blood samples were collected four times daily (0800, 1200, 1600 and 2000 hr) on the day before standing estrus, the day of the onset of standing estrus and the first day after the onset of standing estrus. Thereafter, blood samples were collected once daily (1200 hr) until 15 days postestrus. Analysis of luteinizing hormone (LH) in the plasma revealed similar concentrations for all groups on the day of estrus, but higher (P<.05) values for naturally mated gilts the following morning. Mean concentrations of LH on the first day after the onset of standing estrus were higher (P<.01) for the mated gilts (2.75 ± .54 ng/ml) than for gilts in the Al whole semen (.89 ± .10 ng/ml), Al seminal plasma (1.02 ± .13 ng/ml) and control groups (.92 ± .11 ng/ml). Concentration of LH in the plasma of pregnant gilts tended to be higher after day 9. These results suggest that coitus may prolong the LH surge.

¹ Published with the approval of the Director of the Agr. Exp. Sta.

² Present address: Univ. of Agriculture and Technology, Olsztyn, Poland.