Differences in reproductive performance, embryo development, interferon-tau secretion by the conceptus and luteal function in ewe lambs synchronized in oestrus before or after the spontaneous onset of luteal activity preceding puberty.

Reproduction in Domestic Animals = Zuchthygiene
José-Alfonso AbeciaO Zúñiga

Abstract

In mid-September, 1 month before the insertion of intravaginal pessaries to induce sexual activity, blood samples were collected every 4 days from 16 ewe lambs aged 7 months, in order to determine the incidence of ovulations by measurement of plasma progesterone concentrations. It has been studied whether the response to a progestagen treatment of ewe lambs apparently close to puberty could be modified by the onset of the ovarian events preceding puberty. The effect of the presence or absence of ovulations prior to progestagen treatment on the potential reproductive performance (fertility, litter size and fecundity), embryo development [embryo quality and interferon-tau (IFNtau) secretion], luteal function (progesterone secretion in vitro) and endometrial progesterone content was studied in seven ovulating (Ov+) and nine nonovulating ewe lambs (Ov-) on day 14 after mating. The best potential reproductive results were obtained with Ov+ animals, although these differences could not be initially attributed to either different progesterone secretion in vitro or concentration of endometrial progesterone. Irrespective of the experimental groups, secretion of progesterone by luteal tissue from ewe lambs with normal embryos was signifi...Continue Reading

References

Sep 1, 1988·Journal of Reproduction and Fertility·J A SoutheeW Haresign
Jan 1, 1981·Methods in Enzymology·P C FamillettiS Pestka
Mar 1, 1980·Biology of Reproduction·J G BerardinelliE K Inskeep
Jul 1, 1993·Journal of Reproduction and Fertility·R J ScaramuzziJ R Walton
Apr 1, 1996·American Journal of Reproductive Immunology : AJRI·F W BazerT L Ott
May 26, 1999·Journal of Reproduction and Fertility·K J DemmersA P Flint

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Citations

Feb 14, 2012·Animal Reproduction Science·I ValasiG S Amiridis
Apr 12, 2005·Reproduction in Domestic Animals = Zuchthygiene·G E LammingG E Mann
Apr 25, 2020·Animals : an Open Access Journal From MDPI·Juan J QueredaÁngel Gómez-Martín

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