Preovulatory plasma estradiol-17beta concentrations and ovulation rates in PMSG/anti-PMSG treated heifers.

Preovulatory plasma estradiol-17beta concentrations and ovulation rates in PMSG/anti-PMSG treated heifers. Research Abstract Details 

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Preovulatory plasma estradiol-17beta concentrations and ovulation rates in PMSG/anti-PMSG treated heifers. Abstract Text:

H Callesen,T Greve,P Hyttel,A Bak,P Gotfredsen,P Holm,

Possibilities for early characterization of the superovulatory response were studied in 41 PMSG/PG-treated dairy heifers, of which 21 received an additional treatment of PMSG-antiserum. Plasma was obtained at 33, 36, 41, 47 and 51 h after PG for hormone analyses. After slaughter at 6 or 7 d after insemination, the number of follicles and corpora lutea (CL) were recorded, and ova were recovered for morphological evaluation. Significant correlations were demonstrated between plasma concentrations of estradiol-17beta (E2) at 33, 36 and 41 h after PG and the ovulation rate (number of CL). Each of these correlations was equal to the one found by using the peak concentration of E2 achieved during the preovulatory E2 surge. In heifers with preovulatory E2 surges, as determined with the blood sampling scheme used, both the ovarian response (number of CL and follicles) and the quality of ova recovered (number of transferable embryos) was clearly better compared to heifers without this surge. None of the parameters studied was affected significantly by treatment with PMSG-antiserum. It is concluded that plasma E2 determinations at fixed times in relation to prostaglandin treatment can be used to characterize the superovulatory response in donor cattle in terms of the ovulation rate and the quality of ova recovered. No evidence was found in favor of using PMSG-antiserum for improving either the superovulatory response or such characterization.

Preovulatory plasma estradiol-17beta concentrations and ovulation rates in PMSG/anti-PMSG treated heifers. Publishing Authors By Initials

H Callesen,T Greve,P Hyttel,A Bak,P Gotfredsen,P Holm,

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Preovulatory plasma estradiol-17beta concentrations and ovulation rates in PMSG/anti-PMSG treated heifers. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 34

Page Numbers: 251-8

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Aug

YEAR: 1990

Preovulatory plasma estradiol-17beta concentrations and ovulation rates in PMSG/anti-PMSG treated heifers. Information

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LANGUAGE: eng

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AFFILIATION: Department of Clinical Sciences, Reproduction Royal Veterinary and Agricultural University 13 Bülowsvej, DK-1870 Frederiksberg C, Denmark.

Country: United States

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MEDLINETA: Theriogenology

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