Abstract

In this paper a new method is presented whereby the variance of F^ in 
the cross between two breeds is partitioned into an additive fraction, a 
non-additive fraction, and an environmental one, just as we do in selection 
theory. The concept of combining ability is strictly according to the de
finition given by its first proponents Sprague and Tatum (1942), that is, 
to a partioning into general versus special.combining ability. The model 
used is the usual one given in Falconer (19 8 1). Four stocks of D. melano- 
gaster of diverse origin involving five different traits, body length, 
breast width, wing length, body weight, and number of bristles were employ
ed in the crosses, to test the applicability of the theory proposed. The 
results show that the method is quite general, and with appropriate assump
tions, can be applied in a wide range of cases, in both animal and plant 
breeding.
 

J. S Wu, M. D Li

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XII. Biotechnology, selection experiments, parameter estimation, design of breeding systems, management of genetic resources., , 339–344, 1986
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