1. Oestrus ovis ,sheep Botfly - bot fly stock illustrations

2. Bulling is a behaviour seen in cattle when one mounts another, usually when one or the other is a female in oestrus (on heat); "Bulling" is commonly used as a term for a female in oestrus

3. In order to allow for the necessary adjustments and in particular for the authorisation or the mutual recognition of the pharmaceutical products needed, it is appropriate to phase out the use of oestradiol 17ß for oestrus induction over a given period.