However , males do not appear to recognise these signs , and have been observed to mount non-oestrous females .
Females in oestrus tend to hold their heads further back than usual and commonly display tremors and spasms .
Males do not appear to recognise these signs , and have been observed to mount non-oestrous females .
Females in oestrus tend to hold their heads further back than usual and commonly display tremors and spasms .