174 



TYPES AND MARKET CLASSES OF LIVE STOCK 



Scrub Cow No. 56. 

 Average yearly pro- 

 duction 3874.6 Ibs. of 

 milk and 192.62 Ibs. 

 of fat. 



Half-blood Holstein 

 No. 77, out of Scrub 

 No. 56. Average 

 yearly production 

 6955.5 Ibs. of milk 

 and 266.25 Ibs. of fat. 



Three-quarter- 

 blood Holstein No. 

 233, out of half-blood 

 Holstein No. 77. Av- 

 erage yearly produc- 

 tion 12804.2 Ibs. of 

 milk and 482.54 Ibs. 

 of fat. 



Fig. 50. What Good Purebred Sires Can Do. 



Improved production in two generations through the use of purebred 

 Holstein sires. From the Iowa experiment. 



