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Daily Activity Measures And Milk Yield Immediately Before And After A Fertile Estrus, J. S. Stevenson
Daily Activity Measures And Milk Yield Immediately Before And After A Fertile Estrus, J. S. Stevenson
Kansas Agricultural Experiment Station Research Reports
The objective was to characterize changes in milk yield and other physical measures during a 7-day periestrual period encompassing estrus (day 0) and insemination. Lactating dairy cows milked thrice daily were fitted with CowManager SensOor ear tags capable of assessing real time eating, rumination, resting, high activity (estrus), ear-surface temperature, and providing heat alerts. Daily milk was unchanged during the periestrual period. Daily ear-surface temperature was greater during days 1 to 3 compared with day 0. Daily rumination and resting times reached nadirs on day 0, with decreases occurring 48 hours before estrus. Both rumination and resting times increased by …