Despite the scant attention which the subject received in the 1st World Congress on Genetics Applied to Livestock Production, (1974), it is clear that within the past decade there has been a new wave of interest in both the theoretical and practical aspects of cross breeding systems. The Zeist symposium (1974) gave a broad coverage of the field. In addition, the theory has been reviewed by Dickerson (1973), by Hill (1981), Sheridan (1981), Sedcole (1981), and Kinghom (1982). Recent reviews of practical results include those on pigs (Sellier, 1976), beef cattle (Long, 1980), dairy cattle (Turton, 1980) and sheep (Nitter, 1978). The early history of the concept of heterosis is traced by Hayes (1952), while Wright (1977) has also discussed the development of the theory behind inbreeding and heterosis

E. P Cunningham

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 6. Round tables, , 190–205, 1982
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