HEREDITY: MEANING AND INFLUENCE 23 



the development of the modern dairy cow, one will find that 

 the inheritance of milk or butter-fat production is a great 

 prepotent feature. This prepotency is illustrated in a strik- 

 ing manner in the ancestry of the Holstein-Friesian cow 

 De Kol Creamelle. She produced 780.4 pounds of milk in 

 a week, her daughter Creamelle Vale 750.2 pounds, her 

 granddaughter Dutchland Colantha Vale 765.3 pounds, and 

 her great granddaughter Dutchland Pietertje Vale 750 

 pounds in a week, a remarkable series of records. Anyone 



Figure 5. 



-Hereford bull, 

 Minnesota. 



Disturber 12th, owned by Ferguson Brothers of 

 Photograph from the owners. 



who attempts to estabUsh and develop a herd without being 

 guided by our present-day knowledge of the influence of 

 heredity will certainly fail in his breeding operations. 



The importance of an ideal in breeding can not be over- 

 estimated. Men who have done much to assist in developing 

 breeds and have become famous in this work are com- 

 monly called "constructive breeders." In the upbuilding of 

 the Shorthorn, the Colling Brothers, Bates, the Booths, and 



