CONTENTS 



PAGE 



Review of literature 195 



Methods of investigation 198 



Size character 199 



Shape character 



Photographing the eggs for size and shape studies 202 



Color character 201 



Methods common to studies of all the characters 206 



Results : 208 



Inheritance studies 208 



Variability of production due to differences between the parent types 208 



Inheritance of mean egg type 215 



Relation of egg incubated to mean egg type of bird hatched 227 



Relation of eggs incubated to types of eggs produced by the respective birds 



hatched 244 



Miscellaneous studies 250 



Relationship of size and shape of eggs '. 250 



Incubation effects of egg type 252 



Relative variability of the productions of successive years 253 



Variations in types of eggs produced during successive months and years 254 



Size character 255 



Shape character 259 



Color character 262 



Variations hi types of successive individual eggs 266 



Variations in types of eggs produced in different calendar months 267 



Relation between vigor of the chick and size of the egg from which it was 



hatched 269 



Relation between male and female weights for chicks of the same age 270 



Relation between size of the chick and size of the egg from which it was 



hatched 271 



Discussion of results 305 



Summary 307 



Acknowledgments 309 



Bibliography 310 



191 



478389 



