The widespread global replacement of bulls with artificial
insemination (AI) means that accurate detection and
timing of oestrus becomes a critical activity. Traditional
observation of behavioural signs have been re-evaluated,
but these methods rely on regular visual observation of
cows and an environment conducive to demonstration of
oestrus behaviour. Dr Maggie Fisher BVetMed CBiol MSB
MRQA DipEVPC MRCVS and Dr Peter Holdsworth AO FRSB
FAICD, of Ridgeway Research Ltd, review some of the
detection systems which have been commercialised and
are widely adopted, whilst others remain in the research
laboratory.

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