Sire contribution to pregnancy loss in different periods of embryonic and fetal development of beef cows.

Theriogenology
Gessica Araujo FrancoKy Garrett Pohler

Abstract

The objective was to evaluate the effect of service sire on pregnancy results during different periods of embryonic and fetal development. Angus cows (n = 658) were timed artificially inseminated (TAI) on day 0 after synchronization of estrus using one of eight Angus sires. Estrus expression prior to TAI was evaluated using estrus breeding indicators. Blood samples were collected on days 0, 24 and 31 for quantification of circulating pregnancy-associated glycoprotein (PAG). Pregnancy was diagnosed at day 24 based on blood-based test, and on days 31 and 60 by transrectal ultrasonography to determine early embryonic mortality (EEM; between days 24 and 31) and late embryonic/early fetal mortality (LEM; between days 31 and 60). Sires were retrospectively classified according to the amount of pregnancy loss in each evaluated interval. Overall EEM was 5.54%, with values ranging from 1.8 to 11.7% among sires, whereas LEM was 6.7% with values ranging from 2.3 to 12.6% among sires. Individual sires had different phenotypes in regard to pregnancy loss during different developmental periods, indicating the importance of evaluating multiple milestones of embryonic development when classifying sire fertility. No difference (P ≥ 0.05) was ob...Continue Reading

References

Jul 1, 1980·Journal of Reproduction and Fertility·M G Diskin, J M Sreenan
Mar 4, 2000·Animal Reproduction Science·L D DunneJ M Sreenan
Jun 24, 2004·American Journal of Reproductive Immunology : AJRI·Peter J HansenRoger P Natzke
Aug 11, 2004·Animal Reproduction Science·Melanie J StarbuckE Keith Inskeep
Dec 30, 2014·Animal : an International Journal of Animal Bioscience·D LedouxP Humblot
Mar 10, 2017·Scientific Reports·Sellappan SelvarajuJanivara Parameshwaraiah Ravindra
Feb 13, 2018·Proceedings of the National Academy of Sciences of the United States of America·Joao G N MoraesThomas E Spencer
Mar 9, 2018·Journal of Animal Science·Gessica Araujo FrancoKy Garrett Pohler
Dec 23, 2019·Animal Reproduction Science·S T ReeseK G Pohler

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Citations

Oct 9, 2020·Animal Reproduction·Ky Garrett PohlerRebecca Kyle Poole
Mar 15, 2021·Journal of Dairy Science·E O'CallaghanP Lonergan
Jul 13, 2021·Reproduction in Domestic Animals = Zuchthygiene·Geoffry FordyceMichael R McGowan

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