The aim of this Workshop is to review and discuss current knowledge of quantitative genetics in terms of its application to the task of bringing about effective genetic improvement in our beef cattle and sheep industries. Many of the important production circumstances of these two industries are similar, as are the basic genetic principles which determine optimum improvement plans. Accordingly it was decided, that as a focus for review and discussion, to structure the session around two invited review papers which transcend both species. The first of these deals with "Data collection, processing and the prediction of breeding values" (Johnson and Garrick, 1990); the second with "Industry breeding structures for effecting and evaluating genetic improvement" (Notter and Hohenboken, 1990). Both papers focus on the opportunities offered by current knowledge and some of its technical limitations, as well as on various other circumstances which affect the application of this knowledge to improvement of productivity in commercial flocks and herds. The dissemination of genetic improvement from seedstock producers to commercial herds and flocks is a major issue which receives particular attention in the second review paper by Notter and Hohenboken (1990), as well as in other contributed papers in the session (e.g. Nicoll, 1990) .
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 333–335, 1990
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