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De plus, les recommandations en termes de détection des chaleurs ont été formulées pour les vaches laitières et n\u2019ont pas été mises à jour malgré la constatation d\u2019une moins bonne expression des chaleurs. Cette étude a comparé 256 scénarios d\u2019observation pour lesquels la fréquence, la durée, les moments d\u2019observation et les signes pris en compte ont varié. Ces scénarios ont été testés sur une base de données comportementale de 213 enregistrements vidéos (114 en phase œstrale et 99 en phase lutéale) de vaches allaitantes (Charolaises, Limousines et Blondes d\u2019Aquitaine) logées en stabulation libre. Les résultats montrent qu\u2019il est préférable de prendre en compte tous les signes de chevauchements et les signes sexuels secondaires. Il est conseillé d\u2019observer les animaux à des périodes calmes, 1h30 avant distribution de l\u2019aliment. 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