Diurnal behavior patterns of feedlot bulls during winter and spring in northern latitudes

Journal of Animal Science
H W Gonyou, W R Stricklin

Abstract

The diurnal behavior patterns of feedlot bulls were investigated at 52 degrees N during winter and spring. Two trials were conducted during periods when the daylight portion of the day increased by over 7 h. In trial 1, 324 bulls were observed hourly for 24 h on nine occasions at 2-wk intervals. The average proportions of bulls eating, drinking, standing and lying were 9.8, 1.9, 27.4 and 60.0%, respectively. Major periods of eating, drinking and standing were associated with the times of sunrise and sunset and shifted with seasonal changes. Initiation and termination of the afternoon period of eating was greatly affected by changing times of sunset and not by the daily addition of feed, which always occurred at approximately 1600 h. A significant period of eating, involving up to 15% of the bulls at one time, occurred near midnight during the longer winter night but decreased in duration and intensity as day-length increased. In trial 2, continuous observations for 24 h were made at 2-wk intervals on two groups of nine bulls. When the spread in time between morning and evening activity increased due to longer daylength, bulls were active at midday. This became more pronounced on days when the photoperiod exceeded 10 h. Minor pe...Continue Reading

Citations

Nov 7, 2019·Animals : an Open Access Journal From MDPI·Mohammed Anouar BelaidSergio Calsamiglia
Jun 29, 2002·Applied and Environmental Microbiology·S C WilsonJ J McGlone
Mar 17, 2007·International Journal of Biometeorology·T L MaderJ B Gaughan
Jun 15, 2007·Journal of Applied Animal Welfare Science : JAAWS·Toshie IshiwataToshio Tanaka
Sep 4, 2008·Journal of Animal Science·K StanfordK S Schwartzkopf-Genswein
Jul 14, 2010·Animal Reproduction Science·Tomoko AmanoKazuya Matsumoto

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