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Full-Text Articles in Life 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.
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.
Control Of Clover Infertility In Sheep, H G. Neil, H. E. Fels, C. M. Francis
Control Of Clover Infertility In Sheep, H G. Neil, H. E. Fels, C. M. Francis
Journal of the Department of Agriculture, Western Australia, Series 4
A summary of practices recommended for the control of infertility caused by subterranean clover in West Australian sheep.
PROLONGED grazing of green subterranean clover pastures often reduces ewe fertility. In more extreme cases, obvious signs of clover disease occur.
Continuous Grazing On Rose Clover At Northampton, R J. Parkin
Continuous Grazing On Rose Clover At Northampton, R J. Parkin
Journal of the Department of Agriculture, Western Australia, Series 4
BECAUSE of its upright growth habit, it is often thought that rose clover may require some form of specialised grazing management.
It has also been said that the sheep find the plant and in particular the seed head, undesirable in the dry stages.
However, more recent observations refute this (Bailey 1966). The present commonly-grown strains of rose clover are later flowering generally than the medics or Geraldton subterranean clover and stay green later in the season.
Stocking Rates On Cyprus Barrel Medic In The Northern Wheatbelt, R J. Parkin
Stocking Rates On Cyprus Barrel Medic In The Northern Wheatbelt, R J. Parkin
Journal of the Department of Agriculture, Western Australia, Series 4
IN May 1963, some three weeks after germination, a 4th year stand of Cyprus barrel medic was stocked with Merino wethers.
These same sheep are still grazing the area after three years.
Stinkwort (Inula Graveolens Desf.), G R W Meadly
Stinkwort (Inula Graveolens Desf.), G R W Meadly
Journal of the Department of Agriculture, Western Australia, Series 4
THE original home of stinkwort is the Mediterranean region, including northern France. Apparently the first Australian record was at Onkaparinga in South Australia about 90 years ago.
Efforts were made to keep it in bounds during the years immediately following introduction, but it continued to spread and is now f i r m ly established in all agricultural districts of South Australia.
It also covers large tracts of land in New South Wales and Victoria and occurs in most districts of Western Australia.
Palatability Of Forage Plants In North-West Sheep Pastures, R H. Collett
Palatability Of Forage Plants In North-West Sheep Pastures, R H. Collett
Journal of the Department of Agriculture, Western Australia, Series 4
A DECLINE in carrying capacity has occurred in large areas of the Pilbara district of the North-West, due to the decrease in palatable plants and the increase in unpalatable ones.
The relative palatability of the various species to sheep is therefore a matter of considerable importance to pastoralists.