Anoestrus in cattle

If oestrus has not been observed in a dairy cow by 60 days post partum the condition is defined as Post Partum Anoestrus (PPA), whether she is cycling or not.

Definitions

Anoestrus: The cow is not observed in oestrus either because she has not come into oestrus (not cycling) or because oestrus was not detected (cycling).

True anoestrus: The cow does not come into oestrus because she has inactive ovaries.

Suboestrus: The cow has normal cyclic activity, but is not observed in oestrus due to weak or absent oestrous behaviour, or insufficient observation.

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