Endocrine response of postpartum anestrous beef cows to GnRH or PMSG.

Endocrine response of postpartum anestrous beef cows to GnRH or PMSG. Research Abstract Details 

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Endocrine response of postpartum anestrous beef cows to GnRH or PMSG. Abstract Text:

R P Wettemann,T W Beck,E J Turman,R L Hintz,

Forty-one postpartum anestrous Hereford cows, maintained under range conditions, were used to determine the influence of gonadotropin releasing hormone (GnRH) or pregnant mare serum gonadotropin (PMSG) on ovarian function. Anestrous cows were identified by estrous detection with sterile bulls and concentrations of progesterone in plasma obtained weekly. At 45 +/- 2 days postpartum, cows were allotted to the following treatments: (1) control (saline), (2) 100 mug GnRH, (3) 200 mug GnRH, (4) 200 mug GnRH in carboxymethyl cellulose (CMC), (5) 500 IU PMSG, (6) 1,000 IU PMSG or (7) 2,000 IU PMSG. Cows were bled frequently the first day after treatment and then every other day until 85 days postpartum. The LH responses after 100 and 200 mug of GnRH were not significantly different and mixing 200 mug GnRH with CMC before injection did not significantly alter the LH response. During the first 20 days after treatment, neither GnRH nor 500 IU PMSG altered estradiol concentrations in plasma, but treatment of cows with 1,000 or 2,000 IU PMSG resulted in increased (P<0.01) concentrations of estradiol. The time postpartum required for concentrations of progesterone in plasma to exceed 1 ng/ml was reduced (P<0.05) by all treatments except 100 mug GnRH. These data indicate that GnRH causes LH release in anestrous range cows and that treatment with 1,000 or 2,000 IU PMSG initiates ovarian activity as evidenced by increased concentrations of estradiol in plasma.

Endocrine response of postpartum anestrous beef cows to GnRH or PMSG. Publishing Authors By Initials

RP Wettemann,TW Beck,EJ Turman,RL Hintz,

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Endocrine response of postpartum anestrous beef cows to GnRH or PMSG. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 18

Page Numbers: 599-613

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Nov

YEAR: 1982

Endocrine response of postpartum anestrous beef cows to GnRH or PMSG. Information

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LANGUAGE: eng

NlmUniqueID: 421510

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AFFILIATION: Oklahoma Agricultural Experiment Station, Stillwater 74078 USA.

Country: United States

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MEDLINETA: Theriogenology

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