Short-term selection responses for growth rate in broiler chickens are in fair agreement with theoretical expectations (Siegel, 1962; Jaap, 1963; and Maloney, et al_., 1967). Clayton and Robertson (1957) , however, reported that the long-term behavior of selection for abdominal bristles in Drosophila melanogaster was bewilderingly complex. While Roberts (1966) discussed the lim its to a rtificia l selection for body weight in the mouse, comparable information for other species in unavailable

H. L Marks

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 84–92, 1982
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