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dc.contributor.authorSchilkowsky, Ellen
dc.date.accessioned2020-08-10T20:07:26Z
dc.date.available2020-08-10T20:07:26Z
dc.date.issued2020-05
dc.identifier.otherSchilkowsky_cornell_0058O_10793
dc.identifier.otherhttp://dissertations.umi.com/cornell:10793
dc.identifier.urihttps://hdl.handle.net/1813/70266
dc.description97 pages
dc.description.abstractA study was conducted to evaluate the ability of a commercially available automated estrus detection (AED) system to detect cows in estrus. Estrus was synchronized in lactating dairy cows (n = 216) fitted with an ear-attached sensor that generated estrus alerts based on a combination of physical activity and rumination time data. For seven days after induction of luteolysis, cows were monitored for estrus behaviors using a combination of visual observation and automated monitoring of standing events. Ovulation time was determined via transrectal ultrasonography. The sensitivity, specificity, negative predictive value, positive predictive value and balanced accuracy of the AED system estrus alerts compared with the reference test were 92%, 69%, 53%, 96%, and 80%, respectively. Average alert duration was 13.5 h and interval from alert generation to ovulation was 23.8 h. Parity, milk production level, and circulating progesterone concentrations before estrus were all associated with significant changes in estrus expression.
dc.language.isoen
dc.titleEVALUATION OF AN EAR-ATTACHED SENSOR FOR THE CHARACTERIZATION AND DETECTION OF ESTRUS EVENTS IN DAIRY CATTLE
dc.typedissertation or thesis
thesis.degree.disciplineAnimal Science
thesis.degree.grantorCornell University
thesis.degree.levelMaster of Science
thesis.degree.nameM.S., Animal Science
dc.contributor.chairGiordano, Julio
dc.contributor.committeeMemberCheong, Soon Hon
dc.contributor.committeeMemberSelvaraj, Vimal
dc.contributor.committeeMemberGavalchin, Jerrie
dcterms.licensehttps://hdl.handle.net/1813/59810
dc.identifier.doihttps://doi.org/10.7298/z8nd-s551


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