Lindsay, D R Oestrogenic and antioestrogenic activities of a number of steroids in behavioural oestrus and vaginal smear assays in the ewe. [electronic resource] - The Journal of endocrinology Dec 1969 - 549-55 p. digital Publication Type: Journal Article ISSN: 0022-0795 Standard No.: 10.1677/joe.0.0450549 doi Subjects--Topical Terms: 17-Ketosteroids--pharmacologyAnimalsCastrationDrug SynergismEstradiol--pharmacologyEstrogen AntagonistsEstrogens--pharmacologyEstrus--drug effectsFemaleInjections, IntramuscularInjections, IntravenousPregnancySheep--physiologySpecies SpecificitySteroids--pharmacologyVagina--drug effectsVaginal Smears