THE HATCHING EGG 111 



THOUGHT QUESTIONS 



1. What is the purpose when producing hatching eggs? 



2. What is the most important requirement of the hatching egg? 



3. Enumerate some of the most common causes of poor fertility in 



hatching eggs. 



4. What are some of the causes of dead germs in hatching eggs? 



5. What is the importance of vigor in the breeding stock? 



6. What are some of the essentials in the management of the breeding 



stock? 



7. What are the special factors to be considered when housing the 



breeders? 



8. Discuss the important points to be remembered when collecting 



hatching eggs. 



9. How long should eggs be kept before they are placed in the incu- 



bator? 



10. What is the proper temperature at which hatching eggs should be 



kept before they are placed in the incubator? 



11. How would you select eggs for hatching? 



12. What is the average weight of an egg suitable for hatching? 



13. What is the direct cause of the incubation of the embryo? 



14. What is the correct degree of heat to incubate the chick? 



15. Into what two periods can the development of the chick within 



the shell be divided? 



16. Describe briefly the formation of organs in the growing embryo. 



17. Describe the development of organs just before hatching. 



18. Why is the yolk absorbed just before hatching? 



19. Describe the way in which the chick gets out of the shell. 



20. How long does it take a normal chick to get out of the shell? 



21. What is the length of the incubation period? 



Reference. Consult any standard text on Elementary Em- 

 bryology. 



