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Full-Text Articles in Medicine and Health Sciences
Clover Infertility Of Sheep : Continuing Problem, N R. Adams, Keith Croker
Clover Infertility Of Sheep : Continuing Problem, N R. Adams, Keith Croker
Journal of the Department of Agriculture, Western Australia, Series 4
Some varieties of subterranean clover, notably Dinninup, Dwalganup and Yarloop, contain compounds which act like the female sex hormone oestrogen. These plant oestrogens, or "phyto-oestrogens", interfere with the fertility of sheep and depress the percentage of lambs born.
Over the past 10 years our understanding of clover infertility has increased, and we can now gauge the extent of this residual problem. In fact, there is a widespread but low-level incidence of infertility which does not greatly affect individial farms but which has an important impact on the State's sheep production.
Clover Disease : What Do We Know And What Can We Do, T Marshall
Clover Disease : What Do We Know And What Can We Do, T Marshall
Journal of the Department of Agriculture, Western Australia, Series 4
A review of 30 years' study and practical experience of clover disease in Western Australia—and a summary of current recommendations for reducing problems in sheep grazing pastures based on oestrogenic subterranean clover.
Reproductive Wastage In Sheep On Clover Areas, Department Of Agriculture, Western Australia
Reproductive Wastage In Sheep On Clover Areas, Department Of Agriculture, Western Australia
Journal of the Department of Agriculture, Western Australia, Series 4
Western Australia's 67 per cent lambing for 1970 compares poorly with that of other Australian States, and other countries. From the 12.3 million ewes mated in this State's agricultural areas in 1970, only 8.2 million lambs were marked.
This low 77.7 per cent conception rate sparked the present series of reproductive wastage investigations by the Department's Sheep and Wool Branch.
This report describes the first year's results of the project in W.A.'s "clover disease" areas.
Pasture Legume Varieties And Ewe Fertility, T Marshall, H. E. Fels, H. G. Neil, R. C. Rossiter
Pasture Legume Varieties And Ewe Fertility, T Marshall, H. E. Fels, H. G. Neil, R. C. Rossiter
Journal of the Department of Agriculture, Western Australia, Series 4
ALTHOUGH it was first thought that all varieties of subterranean clover would cause ewe infertility, research in the last 10 to 15 years has shown that varieties differ in potency.
The relative level of potency has also been shown to remain consistent for any one variety under normal conditions.
A Measure Of Clover Infertility In Ewes, N Davenport
A Measure Of Clover Infertility In Ewes, N Davenport
Journal of the Department of Agriculture, Western Australia, Series 4
SERIOUS impairment of the breeding ability of ewes grazed for prolonged periods on growing pastures containing dominant subterranean clover has been experienced in Western Australia for many years.
The first widespread recognition of the problem coincided with the upsurge of improved pasture establishment based on the Dwalganup variety of subterranean clover in the higher rainfall sections of the wheatbelt and adjacent sheep raising areas to the west and south.