Plasma gonadotrophin responses in beef cows two progesterone plus prostaglandin treatment.

Plasma gonadotrophin responses in beef cows two progesterone plus prostaglandin treatment. Research Abstract Details 

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Plasma gonadotrophin responses in beef cows two progesterone plus prostaglandin treatment. Abstract Text:

A R Peters,S R Kingsley,G M Riley,

Progesterone Releasing Intravaginal Devices (Prids) were inserted into six post-partum beef cows for nine days and 0.5 mg cloprostenol was injected i m on day eight. Blood samples were taken via jugular venous catheters at frequent intervals for seven days after Prid removal and assayed for LH, FSH and progesterone. The induced pre-ovulatory type LH and FSH surges occurred between 35 and 123h after Prid withdrawal in five of the cows. In four cows which underwent surges during the time of most intensive sampling, LH levels were significantly higher during the 30h period prior to the LH surge than during the 30h period after the surge. FSH values were low for the 30h period preceding and the 14h period following the time of maximum FSH/LH concentrations. 16 - 30h after the FSH and LH surges, FSH values were again significantly raised compared with the period immediately after the surge. Despite the success of this Prid/PG regime in inducing ovulation, the variability in time between progestagen withdrawal and the LH surge and ovulation is such that the use of fixed time artificial insemination may give poor results.

Plasma gonadotrophin responses in beef cows two progesterone plus prostaglandin treatment. Publishing Authors By Initials

AR Peters,SR Kingsley,GM Riley,

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Plasma gonadotrophin responses in beef cows two progesterone plus prostaglandin treatment. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 16

Page Numbers: 259-69

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Sep

YEAR: 1981

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LANGUAGE: eng

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Grant and Affiliation Information for Plasma gonadotrophin responses in beef cows two progesterone plus prostaglandin treatment.

AFFILIATION: University of Nottingham, School of Agriculture, Sutton Bonington, Loughborough, Leicestershire, U.K.

Country: United States

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MEDLINETA: Theriogenology

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