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OESTROGENS IN BOVINE FETAL AND MATERNAL PLASMA NEAR TERM

Ministry of Agriculture and Fisheries, Research Division, Ruakura Agricultural Research Centre, Hamilton, New Zealand

(Received 8th October 1974)

Administration of exogeneous oestrogens, especially when given early in gestation, will terminate pregnancy in the cow (Hill & Pierson, 1958). Normal calving is preceded by a rise of oestrogen levels in the maternal peripheral plasma (Smith, Edgerton, Hafs & Convey, 1973; Robertson, 1974). Although these data suggest that oestrogens may be important in the initiation of parturition, little is known of the source of this oestrogen rise in the cow. It seemed pertinent, therefore, to determine the levels of oestrogens in fetal and maternal plasma over the last 3 weeks of gestation. In the present paper, the levels of free oestrone and oestradiol-17β in the maternal jugular and utero-ovarian vein plasma and in fetal vena cava plasma in relation to the initiation of parturition in the cow were determined by radioimmunoassay.

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