Follicular wave of the ovulatory follicle and not cyclic status influences fertility of dairy cows

Journal of Dairy Science
R S BisinottoJ E P Santos

Abstract

Two experiments evaluated the influence of follicular wave at artificial insemination (AI) on fertility of dairy cows. In experiment 1, data from 5,607 lactating cows enrolled in estrous and ovulation synchronization programs for AI were evaluated. Cows' blood was analyzed for progesterone 7 to 14 d apart, with the second sample collected on the day of the first GnRH (GnRH1) of the synchronization protocol. Cows were classified as cyclic if progesterone was >or=1 ng/mL in at least 1 of the 2 samples and as anovular if both samples were <1 ng/mL. Cyclic cows were categorized as low (CLOW;<1 ng/mL) or high (CHIGH; >or= 1 ng/mL) progesterone on the day of GnRH1, which would result in ovulation of the dominant follicle of the first (FW) and second (SW) follicular waves, respectively, at AI. Pregnancy per AI (P/AI) was determined 30 and 53 d after AI. In experiment 2, 220 cyclic Holstein cows received 2 injections of PGF(2alpha) administered 14 d apart. The Ovsynch protocol (d 0 GnRH, d 7 PGF(2alpha), d 9 GnRH, d 9.5 timed AI) was initiated either 3 or 10 d after the second PGF(2alpha) of the presynchronization to result in insemination to the FW or SW dominant follicles. Blood was analyzed for progesterone and ovaries were scanned ...Continue Reading

References

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Feb 11, 2009·Reproduction : the Official Journal of the Society for the Study of Fertility·Ronaldo L A CerriJosé E P Santos

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Citations

Apr 8, 2014·Animal : an International Journal of Animal Bioscience·M C WiltbankM G Diskin
Apr 9, 2014·Animal : an International Journal of Animal Bioscience·R S BisinottoJ E P Santos
Feb 8, 2016·Journal of Dairy Science·J S Stevenson, G C Lamb
Nov 28, 2013·Theriogenology·Milo C Wiltbank, J Richard Pursley
Aug 1, 2012·Reproduction in Domestic Animals = Zuchthygiene·T Fair, P Lonergan
Sep 1, 2010·Reproduction in Domestic Animals = Zuchthygiene·W W ThatcherC R Staples
Sep 1, 2014·Journal of Dairy Science·E S RibeiroJ E P Santos
Oct 1, 2011·Theriogenology·M C WiltbankA Gumen
May 11, 2016·Theriogenology·J E P SantosE S Ribeiro
Mar 8, 2012·Reproduction, Fertility, and Development·R S Bisinotto, J E P Santos

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