200 



Types and Market Classes of Live Stock 



Scrub cow No. 56. Av- 

 erage yearly production 

 3,874.6 pounds of milk and 

 192.62 pounds of fat. 



Half-bloc d Holstein No. 

 77, cut of Scrub No. 56. 

 Average yearly production 

 6,955.5 pounds of milk and 

 266.25 pounds of fat. 





0r^w^-^, 



Three-quarter- blood 

 Holstein No. 233, out of 

 half-blood Hol.stein No. 77. 

 Average yearly production 

 12,804.2 pounds of milk and 

 482.54 pounds of fat. 



Fig. 68. — What good purebred sires can do. Improved production in two 

 generations through the use of purebred Holstein sires. From the Iowa experiment. 



