Because of the low intensity in expression of oestrus, more effort is needed to detect oestrus during the summer. For subtropical regions, the efficiency of detecting oestrus has improved by nearly 20 percentage units with observations every 6h as compared to every 12h. Use of mount detectors should improve this even further. Mount detectors that have
proved to be effective include application of paint to the tailhead, commercial mount detectors and, more recently, a radiotelemetric pressure transducer that is placed on the tailhead of a cow with information transmitted on the number as well as the time of
mounts.