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Articles 1 - 6 of 6
Full-Text Articles in Life Sciences
Sheep Lice : Prospects For Eradication, F C. Wilkinson
Sheep Lice : Prospects For Eradication, F C. Wilkinson
Journal of the Department of Agriculture, Western Australia, Series 4
Sheep biting lice have been controlled over the past 86 years in Western australia by a combination of routine insecticidal treatment after shearing and action by the department of Agriculture officers under legislation.
In July 1987 the sheep industry and the State Government will implement a plan to eradicate lice from sheep flocks in the agricultural areas and eventually in the pastoral areas. To achieve this the co-operation of many sectors of the industry will be required. Assuming co-operation is forthcoming, it is possible that by 1996 wool from agricultural areas will be free of lice and insecticidal treatment form …
Production From Heifers And First Calvers, G J. Sawyer
Production From Heifers And First Calvers, G J. Sawyer
Journal of the Department of Agriculture, Western Australia, Series 4
Heifers and first calvers present the major problems of the beef breeding herd. Reproduction rates, calf growth and survival of first calvers are generally much poorer than those of adult breeders.
Early successful reproductive performance is important in beef herds because of the high overhead cost of keeping breeding beef heifers or cows, Where possible, beef producers should aim to join heifers at 14 to 15 months of age. To achieve this goal, producers should set production targets for those animals. These targets will differ from farm to farm depending on when calves are turned off and the seasonal feed …
Herd Improvement Service Forges Ahead, M P. Bond
Herd Improvement Service Forges Ahead, M P. Bond
Journal of the Department of Agriculture, Western Australia, Series 4
Since its establishment three years ago, the Herd Improvement Service has steadily expanded the range of services provided to Western Australian livestock producers. The genetic advancement and improved hers management offered by the service give farmers the ability to use modern technology in the most cost-effective way. There is an increasing realisation amongst farmers that to survive and remain competitive, it is worthwhile to invest in such technology.
The Herd Improvement Service is a statutory corporation which was formed to improve the productivity of the State's livestock enterprises. Most of the organisation's activities have been directed to servicing the dairy …
Barber's Pole Worm : A New Solution, R B. Besier
Barber's Pole Worm : A New Solution, R B. Besier
Journal of the Department of Agriculture, Western Australia, Series 4
Barber's pole worm (Haemonchus contortus) has been a major problem to the sheep industry for many years. About ten million sheep graze in Western Australia's high rainfall areas where barber's pole worm is prevalent, and the annual cost of losses and control totals millions of dollars each year.
Research in progress in Albany now offers the prospect of prolomged and reliable control of barber's pole worm, by means of few drench treatments.
Survival Of Lambs, R W. Kelly, David Lindsay
Survival Of Lambs, R W. Kelly, David Lindsay
Journal of the Department of Agriculture, Western Australia, Series 4
Between one in every five or six lambs that are born each year in Western Australia die at or about the time of birth. This represents a loss approaching two million lambs and is arguably out single greatest wastage in sheep production. The deaths have an immediate impact on lambing performance and therefore lamb sales, and ultimately effects on such areas as selection of breeding replacement stock, the proportion of ewes and weathers that can be run in a self-replacing flock and the amount of wool produced and its uality.
This article summarises information on what influences lamb survival, and …
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.