SELECTION AND IMPROVEMENT OF DAIRY CATTLE 75 



Jersey cattle may become dissatisfied with the milk yield 

 and cross them with Holsteins, expecting to combine the 

 Jersey quality of rich milk with tHe Holstein characteristic of 

 a hirge milk yield. Some animals may show this combi- 

 nation, while just as many may inherit a low yield from the 

 Jersey parent and a low percentage of fat from the Holstein. 

 Th< proper course is first to select the breed that best meets 

 the requirements, and then to continue along this line unless 

 it i.- found after sufficient trial that a serious error has been 

 ma<le. 



QUESTIONS AND PROBLEMS 



1. Calculate the average percentage of fat for the year for two 

 co^ 3 making the following records by months : 



2. Compare the multiplicity of breeds in one neighborhood in 

 this country with conditions in Europe. 



3. What advantages are there in having one breed only in a 

 community? 



4. Are there any breeders' organizations in your county or state? 

 6. Are there any cow- testing associations in your county or 



state? If so, obtain any published results that are available. 



