Detection of noncyling cows by heatmount decectors and ultrasound before treatment with progesterone

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dc.contributor.author Tenhouse, D.E.
dc.contributor.author Krisher, R.L.
dc.contributor.author Lamb, G.C.
dc.contributor.author Dahlen, C.R.
dc.contributor.author Larson, J.E.
dc.contributor.author Pursley, J.R.
dc.contributor.author Bello, Nora M.
dc.contributor.author Fricke, P.M.
dc.contributor.author Wiltbank, M.C.
dc.contributor.author Brusveen, D.J.
dc.contributor.author Burkhart, M.
dc.contributor.author Youngquist, R.S.
dc.contributor.author Garverick, H.A.
dc.contributor.author Stevenson, Jeffrey S.
dc.date.accessioned 2010-11-29T17:52:19Z
dc.date.available 2010-11-29T17:52:19Z
dc.date.issued 2010-11-29
dc.identifier.uri http://hdl.handle.net/2097/6663
dc.description Dairy Research, 2007 is known as Dairy Day, 2007 en
dc.description.abstract Our objective was to determine accuracy of identifying anovulatory lactating dairy cows before the application of a timed AI protocol [with or without progesterone supplementation via a controlled internal drug release (CIDR) insert and 2 different timings of AI] by using heatmount detectors and a single ovarian ultrasound examination. At 6 Midwest locations, 1,072 cows were enrolled in a Presynch protocol (2 injections of prostaglandin F2α (PGF2α) 14 days apart) with the second injection administered 14 days before initiating the Ovsynch protocol (injection of gonadotropin releasing hormone (GnRH) 7 days before and 48 hours after PGF2α injection, with timed AI at 0 or 24 hours after the second GnRH injection). Heatmount detectors were applied to cows at the time of the first Presynch injection, assessed 14 days later at the second Presynch injection and again at initiation of the Ovsynch protocol, and ovaries were examined for presence of a visible corpus luteum (CL) by ultrasound before initiation of treatment. Treatments were assigned to cows based on presence or absence of a visible CL: 1) anovulatory (no CL + CIDR insert for 7 d); 2) anovulatory (no CL + no CIDR); and 3) cycling (CL present). Further, every other cow in the 3 treatments was assigned to be inseminated concurrent with the second GnRH injection of Ovsynch (0 hour) or 24 hours later. Pregnancy was diagnosed at 33 and 61 days after the second GnRH injection. Heatmount detectors and a single ultrasound examination both underestimated proportions of cows classified as anovulatory or having no prior luteal activity compared with those classifications determined by concentrations of progesterone in blood serum. Overall accuracy of heatmount detectors and ultrasound was 71 and 84%, respectively. Application of progesterone to cows without a CL at the time of the first injection of GnRH reduced incidence of ovulation but improved pregnancy rates at day 33 or 61 compared with nontreated cows without a CL at the onset of the Ovsynch protocol. Pregnancy rates and pregnancy survival did not differ for cows having a CL before treatment compared with those not having a CL but treated with progesterone. Pregnancy rates were 1.5-fold greater for cows ovulating in response to the first GnRH injection. Timing of AI at 0 or 24 hours after the second GnRH injection did not alter pregnancy rates, but cows having prior luteal activity before treatment had improved pregnancy rates compared with anovulatory cows. We conclude that identifying anovulatory cows by ultrasound was more accurate than by heatmount detectors. Subsequent treatment of potential anovulatory cows with progesterone failed to improve fertility but had benefit for cows with prior estrous cycles at the onset of the timed AI (TAI) protocol, regardless of luteal status before the final luteolytic injection of PGF2α. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Dairy Day, 2007 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 08-127-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 984 en_US
dc.subject Dairy en_US
dc.subject Anovulation en_US
dc.subject Controlled internal drug release en_US
dc.subject Ovsynch en_US
dc.subject Pregnancy rates en_US
dc.title Detection of noncyling cows by heatmount decectors and ultrasound before treatment with progesterone en_US
dc.type Conference paper en_US
dc.date.published 2007 en_US
dc.citation.epage 21 en_US
dc.citation.spage 12 en_US
dc.contributor.authoreid jss en_US

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