REVIEW 265 



4. Hatching the eggs from each individual hen together either 

 in special compartments or in cheese cloth bags. 



5. Marking each chick as hatched either by web mark or leg 

 band. If the latter is used it should later be transferred to the 

 wing as a permanent record. 



REVIEW. 



1. Name four objects toward which all poultry breeding of a commercial 



nature is tending. 



2. What are the commercial possibilities of crossbreeding? 



3. Define "grading up," and state its commercial possibilities. 



4. Define "inbreeding," and name three ways in which it is possible to 



inbreed. 



5. What can you say of the prepotency of in-bred progeny? 



6. Define Une breeding; what are its possibiUties in commercial breeding ? 



7. Define "out-crossing" and give its use. 



8. What is meant by reciprocal crosses? 



9. What are the possibilities of sex control? 



10. Give a brief summary of the possibilities of different breeding systems. 



11. Define and give the fundamental advantage of selection. 



12. Give two results of proper selection. 



13. Enumerate and discuss briefly nine rules which should be considered in 



breeding for egg production. 



14. Give three features which should be considered in selecting for egg pro- 



duction. 



15. Discuss the factor of constitutional vigor in breeding. 



16. Enumerate some of the contributory causes to lack of vigor. 



17. What are some of the signs of vitality and lack of it? 



18. Give nine points which are associated with high egg production. 



19. What is the value of good size among egg breeds? 



20. Discuss three factors which should be considered when breeding for meat 



production. 



21. Discuss "double matings" for color and plumage markings. 



22. What is meant by sexual dimorphism? 



23. Give some important considerations in breeding for color. 



24. What are the causes of "brassiness or creaminess?" 



25. Name some soil effects upon plumage and shank color. 



26. What, if any, is the effect of a previous impregnation upon subsequent 



chicks? 



References. — Breeding Poultry for Egg Production, by Raymond Pearl, 

 Maine Bulletin 192. Importance of Constitutional Vigor in the Breeding of 

 Poultry, by Rice and Rogers, Cornell Reading Course Bulletin 45. Inherit- 

 ance of Fecundity, by Pearl and Surface, Maine Bulletin 166. Appliances 

 and Methods for Pedigree Poultry Breeding, by Pearl and Surface, Maine 

 Bulletin 159. A Barometrical Study of Egg Production in the Domestic 

 Fowl, by Pearl and Surface, U. S. Bureau of Animal Industry Bulletin 110 

 (in two parts). The Single Testing System of Breeding for Egg Production, 

 by D. F. Laurie, Department of Agriculture, South Australia. Breeding for 

 Egg Production and Egg Types, by James Dryden, Utah Bulletin 92. 



