The effect of follicle age on pregnancy rate in beef cows

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorAbreu, F. M.
dc.creatorGeary, T. W.
dc.creatorCruppe, L. H.
dc.creatorMadsen, C. A.
dc.creatorJinks, E. M.
dc.creatorPohler, K. G.
dc.creatorVasconcelos, José Luiz Moraes
dc.creatorDay, M. L.
dc.date2014-12-03T13:10:39Z
dc.date2016-10-25T20:11:01Z
dc.date2014-12-03T13:10:39Z
dc.date2016-10-25T20:11:01Z
dc.date2014-03-01
dc.date.accessioned2017-04-06T06:21:47Z
dc.date.available2017-04-06T06:21:47Z
dc.identifierJournal Of Animal Science. Champaign: Amer Soc Animal Science, v. 92, n. 3, p. 1015-1021, 2014.
dc.identifier0021-8812
dc.identifierhttp://hdl.handle.net/11449/112366
dc.identifierhttp://acervodigital.unesp.br/handle/11449/112366
dc.identifier10.2527/jas2013-6760
dc.identifierWOS:000332035900017
dc.identifierhttp://dx.doi.org/10.2527/jas2013-6760
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/923128
dc.descriptionThe effect of the age of the ovulatory follicle on fertility in beef cows was investigated. Multiparous (n = 171) and primiparous (n = 129) postpartum beef cows in 2 groups (G1 and G2) received estradiol benzoate (EB; 1 mg/500 kg BW, intramuscular [i.m.]) 5.5 d (G1; n = 162) and 6.5 d (G2; n = 138) after the final GnRH of a synchronization program (5d CO-Synch + CIDR) to induce emergence of a new follicular wave (NFW), followed by prostaglandin F2 alpha (PGF2 alpha; 25 mg, i.m.) administration either 5.5 d (young follicle, YF; n = 155) or 9.5 d (mature follicle, MF; n = 145) after EB. Estrous detection coupled with AI 12 h later (estrus-AI) was performed for 60 h (MF) and 84 h (YF) after PGF(2 alpha); cows not detected in estrus within this period received timed AI (TAI) coupled with GnRH at 72 and 96 h, respectively. Within the first 72 h after PGF(2 alpha), more (P < 0.01) cows in the MF (76.3%) than YF treatment (47.7%) exhibited estrus, but through 96 h, the proportion detected in estrus (P < 0.05) and interval from PGF(2 alpha) to estrus (P < 0.01) were greater in the YF than MF treatment (88.6% vs. 76.3%, 78.9 +/- 0.8 vs. 57.5 +/- 1.6 h, respectively). Age of the ovulatory follicle at AI was greater (P < 0.01) in the MF (9.32 +/- 0.04 d) than YF (6.26 +/- 0.02 d) treatment, but follicle diameter at AI and pregnancy rates did not differ between MF (13.1 +/- 0.2 mm; 72.0%) and YF (12.9 +/- 0.1 mm; 67.1%) treatments. Regardless of treatment, the diameter of the ovulatory follicle at AI and pregnancy rate were greater (P < 0.01) with estrus-AI (13.1 +/- 0.1 mm; 75.0%) than TAI (12.6 +/- 0.2 mm; 55.4%). Cows in the MF treatment that initiated a second NFW after EB but before PGF(2 alpha) (MF2; n = 47) were induced to ovulate with GnRH and TAI at 72h, when ovulatory follicles were 4 d old and 10.2 +/- 0.2 mm in diameter. Pregnancy rate for TAI (51.1%) in MF2 did not differ from TAI pregnancy rate (55.4%) across the MF and YF treatments. In summary, the age of the ovulatory follicle affected interval to estrus and AI but did not influence pregnancy rate in suckled beef cows.
dc.languageeng
dc.publisherAmer Soc Animal Science
dc.relationJournal of Animal Science
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectcows
dc.subjectfollicle age
dc.subjectpregnancy rate
dc.titleThe effect of follicle age on pregnancy rate in beef cows
dc.typeOtro


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