title: Oestradiol levels in sheep plasma during the oestrous cycle.
abstract: The concentration of oestradiol was measured by radioimmunoassay in ovarian venous plasma collected from ewes of three breeds (Finnish Landrace, Scottish Blackface and Tasmanian Merino) on Day 9 of the oestrous cycle and in jugular venous plasma collected daily around oestrus in two of these breeds. The mean +/- s.e.m. concentration in the ovarian venous plasma of the Merino (44.1 +/- 7.6 pg/ml) was lower than that in Blackface (72.2 +/- 10.2 pg/ml) and Finn ewes (66.8 +/- 10.2 pg/ml). The overall fitted mean concentration in peripheral venous plasma was 1.7 pg oestradiol-17beta/ml, with no difference between the Finn and Blackface ewes, in which the highest preovulatory values were 3.9 +/- 0.5 and 3.4 +/- 0.5 pg/ml respectively.
mesh_terms: D000818:Animals; D004958:Estradiol / Q000097:blood*; D004971:Estrus; D005260:Female; D010060:Ovulation; D011247:Pregnancy; D012756:Sheep / Q000097:blood* / Q000235:genetics
chemical_list: D004958:Estradiol