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No significant breed or seasonal differences were found for length of oestrus and time of ovulation after end of oestrus among Ayrshires, Guernseys, Jerseys and Holsteins.
Duration of oestrus of 17.8 hrs. for 86 cows was significantly longer than the average of 15.3 hrs. for 46 heifers. The cows ...

Research Bulletin. Nebraska Agricultural Experiment Station, 1948, 153, pp 26 pp.