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The objective of the study was to compare three systems for estrus detection and combinations of these systems on a large commercial dairy (1075 lactating cows) during stress of summer heat. At 37–45 days in milk (DIM), 255 cows were fitted with a HeatWatch ® device (HW; DDx Inc., Denver, CO), an activity sensor ALPRO ® (ALPRO; DeLaval Inc., Kansas City, MO), and visually observed...
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