Contents 



Technical Committee Membership 3 



Contrihuting Projects 4 



Introduction 7 



History 7 



Procedure 8 



Results : 



A. Breeding Methods 9 



Randombred Populations 9 



Mass Selection 10 



Crossbreeding 10 



Recurrent Selection 11 



Diallel Matings 11 



Gamma Irradiation 11 



Summary .' 11 



B. Genetic Correlations and Selection Response 12 



Biological Selection Indexes 12 



Blood Pressure 13 



Meat Spots 13 



Serum Cholesterol 14 



Summary ; 14 



C. Individual Trait Analysis and the 



Physiology of Gene Action 15 



Plasma Proteins 15 



Plumage Color 15 



Shank Pigmentation 16 



Thyroid Activity 16 



Yolk Cholesterol 17 



Embryo Weight 18 



Feed Efficiency 18 



Immunogenetics 18 



Summary 18 



D. Gene-Environmental Interactions 19 



Nutritional Environment 19 



Raising Sexes Separately 19 



Randombred Populations 19 



Summary 20 



Conclusions 20 



Publications 21 



Tables 24 



