has part has part has_part characteristic of has modifier estrus abnormal estrous cycle abnormal estrus MP:0009016 abnormal estrous MPheno.ontology any anomaly or aberrant timing of the phase of the estrous cycle which begins with the ovulation of fully mature oocytes and during which the vulva remains in an extended state with an open vagina, and females are maximally receptive to male advances abnormal estrous phase abnormal oestrous quality abnormal