Observations with heatwatch to detect estrus by radiotelemetry in cattle

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dc.contributor.author Smith, M.W.
dc.contributor.author Hoffman, D.P.
dc.contributor.author Lamb, G.C.
dc.contributor.author Kobayashi, Y.
dc.contributor.author Stevenson, Jeffrey S.
dc.date.accessioned 2011-05-06T20:22:21Z
dc.date.available 2011-05-06T20:22:21Z
dc.date.issued 2011-05-06
dc.identifier.uri http://hdl.handle.net/2097/8796
dc.description.abstract In Experiment 1, the effectiveness of two estrus-detection methods (visual observation vs radiotelemetric, pressure-sensitive, rumpmounted devices [HeatWatch®]) were compared in heifers. A pressure sensitive device containing a battery-operated radio transmitter was affixed to the tailhead rump area of each of 41 heifers. Activation of the sensor sent a radiotelemetric signal to a microcomputer via a fixed radio antenna. Heifer identification, date, time of day, and duration of standing events were recorded. Estrus was synchronized, and heifers were observed visually for signs of estrus. Number of standing events during estrus, determined by the radiotelemetric device, averaged 50.1 ± 6.4 per heifer, with the duration of estrus ranging from 2.6 to 26.2 hr (average = 14 ± .8 hr). Number of standing events and duration of estrus were greater, but duration of standing events was similar, for heifers identified in estrus by both methods compared to those identified by the radiotelemetric device alone, indicating that heifers with a limited number of standing events and estrus of shorter duration were missed by visual observation. In Experiment 2, the average number of standing events during estrus was greater when estrus was induced early (days 6 to 9) in the cycle by PGF compared to those 2a induced later (after day 10) in the cycle. Regardless of when injections of PGF2a occurred during the cycle, duration of standing events and duration of estrus were unaffected. Radiotelemetric devices are useful in identifying a greater proportion of heifers in estrus (increased efficiency) compared to visual observation with similar accuracy. en_US
dc.publisher Kansas Agricultural Experiment Station en_US
dc.relation.isPartOf Dairy Day, 1995 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 96-106-S en_US
dc.relation.isPartOf Report of progress (Kansas Agricultural Experiment Station and Cooperative Extension Service); 742 en_US
dc.subject Radiotelemetry en_US
dc.subject Pressure sensors en_US
dc.subject Estrus en_US
dc.subject Heifers en_US
dc.subject Heat Detection en_US
dc.title Observations with heatwatch to detect estrus by radiotelemetry in cattle en_US
dc.type Conference paper en_US
dc.date.published 1995 en_US
dc.citation.epage 44 en_US
dc.citation.spage 41 en_US
dc.description.conference Dairy Day, 1995, Kansas State University, Manhattan, KS, 1995
dc.contributor.authoreid jss en_US

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