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The study used four groups of Holstein-Friesian cows (2 heifers and 2 cows), which were fitted with pedometers (AfiAct and Gyuho) for a period of 65 days. Daily and monthly activity of the cows was analysed with regard to age, lactation, production level, lactation stage and the time of estrus onset. Efficiency of both pedometry systems in the detection of estrus in cows and heifers was determined...
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