530 BIOLOGY AND HUMAN LIFE 



5. Producing new varieties 



Find mutation or desirable type 



Hybridize (outbreed) 



Inbreed hybrids for segregation 



Try out selected combinations for pure breeding 



Inbreed to fix type 



Multiply 



Destroy undesirable and unstable forms 



6. Improving quality of herd or flock 



Grading up 



7. Value of animal breeding 



Increase yield (milk, eggs, fat, silk, wool) 

 Improve quality of yield (finer fiber, finer meat, faster) 

 Examples from current developments 

 Cows; horses; hens; sheep: pigs; dogs 



QUESTIONS 



1. What qualities would make one kind of animal more easily do- 

 mesticated than another ? 



2. What qualities in an animal would make it more worth while to 

 domesticate ? 



3. What is the value of the reindeer as a domestic animal ? of the 

 goat? of the camel? 



4. Why are different breeds of cattle prevalent in different parts of 

 the country? 



5. What new varieties of animals have been recently developed or 

 introduced in your com.munity or region ? 



6. How many different varieties of dog do you know? of pigeon? 

 of cat ? 



7. In what respects do the various breeds of cow differ from each 

 other ? of chicken ? of horse ? 



8. Is the use of horses increasing or decreasing in the country as a 

 whole? Why? Is this equally true in all regions? Why? Is this 

 equally true of all varieties of horse ? Why ? 



9. What are the best egg-layers in your region or county ? What are 

 their records ? Of what breed are they? How do their records compare 

 with others of the same breed ? of different breeds ? 



