Influence of naloxone and yohimbine administration on pulsatile LH secretion in luteal phase beef cows.

Influence of naloxone and yohimbine administration on pulsatile LH secretion in luteal phase beef cows. Research Abstract Details 

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Influence of naloxone and yohimbine administration on pulsatile LH secretion in luteal phase beef cows. Abstract Text:

H M Schoenemann,M W Richards,S Sangiah,R P Wettemann,

This study examined the effects of two specific neurotransmitter receptor antagonists, naloxone (NAL; mu-opioid) and yohimbine (YOH; alpha(2)-adrenergic), on pulsatile luteinizing hormone (LH) release during the luteal phase (Day 10; Day 0 = estrus) of beef cows. Treatments were saline i.m. (C; n = 4); 1mg/kg NAL i.m. followed 3 h later by two 0.5 mg/kg injections spaced 2.5 h apart (N; n = 4); 0.2 mg/kg YOH i.v. (Y; n = 3); or combined N and Y regimens, with Y preceding N by 30 min (NY; n = 4). Blood samples were collected for 8 h before (Period I) and after (Period II) initiation of treatment. Respiration rates of Y cows were similar to C cows during Period II. However, respiration rates of N and NY animals increased 70% within 30 min of the first NAL injection. Acute LH release was not observed in response to either NAL or YOH. Pulsatile LH secretion was unchanged in N, Y and NY cows during Period II when compared with Period I. In contrast, basal and pulsatile LH secretion was inhibited in C cows during Period II. The inhibition of LH secretion in C animals following NAL indicate that the cows were under stress during Period II. Thus, these data suggest that the inhibition of LH release in stressed animals can be overcome by pharmacologic attenuation of inhibitory (N) or accentuation of stimulatory (Y) signals to LHRH-containing neurons.

Influence of naloxone and yohimbine administration on pulsatile LH secretion in luteal phase beef cows. Publishing Authors By Initials

HM Schoenemann,MW Richards,S Sangiah,RP Wettemann,

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Influence of naloxone and yohimbine administration on pulsatile LH secretion in luteal phase beef cows. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 33

Page Numbers: 509-18

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Feb

YEAR: 1990

Influence of naloxone and yohimbine administration on pulsatile LH secretion in luteal phase beef cows. Information

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LANGUAGE: eng

NlmUniqueID: 421510

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Grant and Affiliation Information for Influence of naloxone and yohimbine administration on pulsatile LH secretion in luteal phase beef cows.

AFFILIATION: Department of Animal Science Oklahoma Agricultural Experiment Station Stillwater, OK 74078 USA.

Country: United States

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MEDLINETA: Theriogenology

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