42 METHODS OF IMPROVEMENT 



are now casting about for a way to get breeds which possess the 

 good points of the cross-bred animals they have been producing. 

 Corriedales are being "tried out," and there is some tendency to 

 develop a breed or breeds by a method similar to that pursued in 

 evolving the Corriedale. 



Cross-breeding is still extensively practiced in England by 

 breeders who plan to sell their lambs for mutton. It is likely, too, 

 that it will be resorted to, to greater or less extent, in all countries 

 recognized as being important in the production of mutton, be- 

 cause the cross-bred lamb is, as a rule, unusually vigorous and in 

 many regions breeders find it to their advantage to keep ewes of 

 such breeding that a foreign breed must be crossed on them to get 

 the best possible market lambs from them. 



QUESTIONS 



1. What part has better feeding had in the improvement of sheep? 



2. Enumerate the different methods of breeding by which improvement has 



been effected. 



3. What are the methods followed in mass breeding? 



4. What were some of the effects from the early study of matings? 



5. What can be said of the importance and limits of pedigrees? 



6. Explain the meaning of in-and-in breeding. 



7. Of line breeding. 



8. What may be some uses of cross breeding? 



