Origin of oestrus
Examples from the Web for oestrus
It is, however, less prominent than in oestrus, and does not gape.
Females examined in February mostly were perforate and many of them appeared to be in oestrus.Ecological Observations on the Woodrat, Neotoma floridana|Henry S. Fitch
Females which had borne and suckled young were first found to be in oestrus 65 to 104 days after birth of the young.American Weasels|E. Raymond Hall
An apparent instance of hostility between rival males competing for an oestrus female was observed on September 2, 1950.
Vaginal smears at this stage often showed nucleated cells characteristic of oestrus.