J. Anim Sci.
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J. Anim Sci. 1983. 57:706-709.
© 1983 American Society of Animal Science
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Effect of Epinephrine, Norepinephrine and(or) GnRH on Serum LH in Prepuberal Beef Heifers1,2,

D. R. Hardin3 and R. D. Randel

Texas A&M University Agricultural Research and Extension Center, Overton 75684

Abstract

Forty prepuberal Simmental x Brahman-Hereford heifers were utilized to determine the effects of epinephrine (E), norepinephrine (NE), gonadotropin releasing hormone (GnRH) or combinations of GnRH + E and GnRH + NE on serum luteinizing hormone (LH) concentrations. Animals were assigned randomly to one of five treatments with four replicates/treatment. Treatments consisted of I) 100 µg GnRH at time 0 (n = 8); II) 50 mg NE at time –15 and 0 (n = 8); III) 50 mg E at time –15 and 0 (n = 8); IV) 100 µg GnRH at time 0, plus 50 mg NE at time –15 and 0 (n = 8) and V) 100 pg GnRH at time 0, plus 50 mg E at time –15 and 0 (n = 8). All treatment compounds were administered im in 2 ml physiological saline and blood samples were collected via tail vessel puncture at –30, –15, 0, 15, 30, 45, 60, 90, 120, 180, 240, 300 and 360 min from GnRH injection. Treatment with NE or E alone had no effect (P>.10) on serum LH during the sampling period. The initial LH release to GnRH was altered (P<.05) by concomitant treatment with NE (treatment IV) or E (treatment V). Magnitude of the LH release was reduced (P<.01) by treatment V. Area under the LH surge was reduced (P<.05) by treatment IV (NE) and V (E).

Footnotes

1 Journal Paper TA 17857, Texas A&M Univ. Agr. Exp. Sta.

2 This study was a contribution to the Western Regional Research Project, W-112, "Reproductive Performance in Domestic Ruminants."

3 Present address: BAYVET, Reproduction Business Unit, Box 390, Shawnee, KS 66201.






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Copyright © 1983 by the American Society of Animal Science.