There are relatively few complete diallel cross studies reported with egg-type chickens in recent years, and none of the recent studies have used stocks equivalent to those being used by the industry.  Recently Fairfull et all. (1982) have reported in detail on the first year performance of six long-term selected strains that were crossed in a complete diallel.  These birds were force moulted and put through a second year performance test to enable estimates to be made for the first time, as far as these authors can determine, of the general (GCA) and specific (SCA) combinability, heterosis and reciprocal effects for second year performance.  Despite the growing interest in the use of commercial stocks (ie. strain-crosses) in the second production year remarkably little has been reported ont he performance of parent stocks and their strain crosses in the second year, and on how this performance is related to the first year results.  The results of the diallel cross experiement carried over to the second production year are reported here and contrasted with first production year performance data.

R. S Gowe, R. W Fairfull

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 6. Round tables, , 228–242, 1982
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