Using estrus detection patches to optimally time insemination improved pregnancy risk in suckled beef cows enrolled in a fixed-time artificial insemination program

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dc.contributor.author Hill, Scott L.
dc.contributor.author Grieger, David M.
dc.contributor.author Olson, K.C.
dc.contributor.author Jaeger, John R.
dc.contributor.author Dahlen, C. R.
dc.contributor.author Bridges, G. A.
dc.contributor.author Dantas, F.
dc.contributor.author Larson, J. E.
dc.contributor.author Muth-Spurlock, A. M.
dc.contributor.author Ahola, J. K.
dc.contributor.author Fischer, M. C.
dc.contributor.author Perry, G. A.
dc.contributor.author Larimore, E. L.
dc.contributor.author Steckler, T. L.
dc.contributor.author Whittier, W. D.
dc.contributor.author Currin, J. F.
dc.contributor.author Stevenson, Jeffrey S.
dc.date.accessioned 2017-11-30T21:38:57Z
dc.date.available 2017-11-30T21:38:57Z
dc.identifier.uri http://hdl.handle.net/2097/38290
dc.description Citation: Hill, S. L., Grieger, D. M., Olson, K. C., Jaeger, J. R., Dahlen, C. R., Bridges, G. A., . . . Stevenson, J. S. (2016). Using estrus detection patches to optimally time insemination improved pregnancy risk in suckled beef cows enrolled in a fixed-time artificial insemination program. Journal of Animal Science, 94(9), 3703-3710. doi:10.2527/jas2016-0469
dc.description.abstract A multilocation study examined pregnancy risk (PR) after delaying AI in suckled beef cows from 60 to 75 h when estrus had not been detected by 60 h in response to a 7-d CO-Synch + progesterone insert (CIDR) timed AI (TAI) program (d-7: CIDR insert concurrent with an injection of GnRH; d 0: PGF(2 alpha) injection and removal of CIDR insert; and GnRH injection at TAI [ 60 or 75 h after CIDR removal]). A total of 1,611 suckled beef cows at 15 locations in 9 states (CO, IL, KS, MN, MS, MT, ND, SD, and VA) were enrolled. Before applying the fixed-time AI program, BCS was assessed, and blood samples were collected. Estrus was defined to have occurred when an estrus detection patch was >50% colored (activated). Pregnancy was determined 35 d after AI via transrectal ultrasound. Cows (n = 746) detected in estrus by 60 h (46.3%) after CIDR removal were inseminated and treated with GnRH at AI (Control). Remaining nonestrous cows were allocated within location to 3 treatments on the basis of parity and days postpartum: 1) GnRH injection and AI at 60 h (early-early = EE; n = 292), 2) GnRH injection at 60 h and AI at 75 h (early-delayed = ED; n = 282), or 3) GnRH injection and AI at 75 h (delayed-delayed = DD; n = 291). Control cows had a greater (P < 0.01) PR (64.2%) than other treatments (EE = 41.7%, ED = 52.8%, DD = 50.0%). Use of estrus detection patches to delay AI in cows not in estrus by 60 h after CIDR insert removal (ED and DD treatments) increased (P < 0.05) PR to TAI when compared with cows in the EE treatment. More (P < 0.001) cows that showed estrus by 60 h conceived to AI at 60 h than those not showing estrus (64.2% vs. 48.1%). Approximately half (49.2%) of the cows not in estrus by 60 h had activated patches by 75 h, resulting in a greater (P < 0.05) PR than their nonestrous herd mates in the EE (46.1% vs. 34.5%), ED (64.2% vs. 39.2%), and DD (64.8% vs. 31.5%) treatments, respectively. Overall, cows showing estrus by 75 h (72.7%) had greater (P < 0.001) PR to AI (61.3% vs. 37.9%) than cows not showing estrus. Use of estrus detection patches to allow for a delayed AI in cows not in estrus by 60 h after removal of the CIDR insert improved PR to TAI by optimizing the timing of the AI in those cows.
dc.relation.uri https://doi.org/10.2527/jas.2016-0469
dc.rights Copyright © 2016. American Society of Animal Science. This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
dc.rights.uri https://www.animalsciencepublications.org/files/publications/jas/jas-instructions-to-authors-050917.pdf
dc.subject Beef Cattle
dc.subject Estrus Detection
dc.subject Timed Ai
dc.subject Progesterone Concentrations
dc.subject Embryonic-Development
dc.subject Delayed
dc.title Using estrus detection patches to optimally time insemination improved pregnancy risk in suckled beef cows enrolled in a fixed-time artificial insemination program
dc.type Article
dc.date.published 2016
dc.citation.doi 10.2527/jas.2016-0469
dc.citation.epage 3710
dc.citation.issn 0021-8812
dc.citation.issue 9
dc.citation.jtitle Journal of Animal Science
dc.citation.spage 3703
dc.citation.volume 94
dc.description.embargo 2017-09
dc.contributor.authoreid jss
dc.contributor.authoreid jrjaeger
dc.contributor.authoreid kcolson
dc.contributor.authoreid dgrieger
dc.contributor.kstate Stevenson, Jeffrey S.
dc.contributor.kstate Jaeger, John R.
dc.contributor.kstate Olson, KC
dc.contributor.kstate Grieger, David M.


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