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Bioscientifica Proceedings (2019) 1 REDRREDR21 | DOI: 10.1530/biosciprocs.1.021


A changed responsiveness to oestrogen in ewes with clover disease

NR Adams


Division of Animal Health, CSIRO, Institute of Agriculture, University of Western Australia, Nedlands, Western Australia 6009

Summary. When clover-infertile ewes are subsequently exposed to non-oestrogenic pasture, they have a reduced fertilization rate, due to an inability to store spermatozoa in the cervix, and the cervical mucus has a reduced spinnbarkeit, caused by a slower response to oestrogenic stimulation. Vaginal cell keratinization and oestrous behaviour occurred more slowly after treatment of affected ewes with oestrogen. Other changes in affected ewes suggest that phyto-oestrogens have permanent mild differentiating effects on adults. Sexual behaviour is masculinized, the cervix takes on a uterine-like appearance and the genital tract becomes permanently oestrogenized. The manner in which these changes relate to the altered responsiveness to oestrogen remains to be clarified.

© 1981 Journals of Reproduction & Fertility Ltd

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Reproductive Endocrinology of Domestic Ruminants

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