Decreased pulsatile LH secretion in heifers superovulated with eCG or FSH.

Decreased pulsatile LH secretion in heifers superovulated with eCG or FSH. Research Abstract Details 

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Decreased pulsatile LH secretion in heifers superovulated with eCG or FSH. Abstract Text:

M K Ben Jebara,P D ,C A Price,

This study was designed to test the hypothesis that treatment with super-ovulatory drugs suppresses endogenous pulsatile LH secretion. Heifers (n=5/group) were superovulated with eCG (2500 IU) or FSH (equivalent to 400 mg NIH-FSH-P1), starting on Day 10 of the estrous cycle, and were injected with prostaglandin F(2alpha) on Day 12 to induce luteolysis. Control cows were injected only with prostaglandin. Frequent blood samples were taken during luteolysis (6 to 14 h after PG administration) for assay of plasma LH, estradiol, progesterone, testosterone and androstenedione. The LH pulse frequency in eCG-treated cows was significantly lower than that in control cows (2.4 +/- 0.4 & 6.4 +/- 0.4 pulses/8 h, respectively; P<0.05), and plasma progesterone (3.4 +/- 0.4 vs 1.8 +/- 0.1 ng/ml, for treated and control heifers, respectively; P<0.05) and estradiol concentrations (25.9 +/- 4.3 & 4.3 +/- 0.4 pg/ml, for treated and control heifers, respectively; P<0.05) were higher compared with those of the controls. No LH pulses were detected in FSH-treated cows, and mean LH concentrations were significantly lower than those in the controls (0.3 +/- 0.1 & 0.8 +/- 0.1, respectively; P<0.05). This suppression of LH was associated with an increase in estradiol (9.5 +/- 1.4 pg/ml; P<0.05 compared with controls) but not in progesterone concentrations (2.1 +/- 0.2 ng/ml; P>0.05 compared to controls). Both superovulatory protocols increased the ovulation rate (21.6 +/- 3.9 and 23.0 +/- 4.2, for eCG and FSH groups, respectively; P>0.05). These data demonstrate that super-ovulatory treatments decrease LH pulse frequency during the follicular phase of the treatment cycle. This could be explained by increased steroid secretion in the eCG-trated heifers but not in FSH-treated animals.

Decreased pulsatile LH secretion in heifers superovulated with eCG or FSH. Publishing Authors By Initials

MK Ben Jebara,PD ,CA Price,

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Decreased pulsatile LH secretion in heifers superovulated with eCG or FSH. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 42

Page Numbers: 685-94

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Sep

YEAR: 1994

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LANGUAGE: eng

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AFFILIATION: Animal Reproduction Research Centre Faculty of Veterinary Medicine University of Montreal C.P. 5000 Saint-Hyacinthe, Québec, Canada J2S 7C6.

Country: United States

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MEDLINETA: Theriogenology

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