204 



THE BREEDING OF ANIMALS 



nearly always valued by the amount of butter-fat which 

 it contains, and Rose produced on the same feed basis 

 1.807 times as much butter-fat as Nora, the difference in 

 yield between the two cows was 252.27 Ib. of butter-fat 

 or 294.31 Ib. of butter per year. This at 16 cents per 

 pound, which is the average value of butter before being 

 made up, would amount to $47.09 per year. Supposing 

 that the cows would yield in this ratio for six years, 

 from the age of four to ten, which is a conservative 

 estimate, Rose would produce $282.54 worth of butter 

 more than Nora on exactly the same kind and quantity 

 of feed : 



RECORD OP THE Two Cows FOR ONE YEAR COMPUTED ON 

 A LIKE FEED BASIS 



" In this comparison Rose was at a disadvantage in 

 two ways. She was nine years of age and on the down 

 grade of life while Nora was just in her prime. Rose was 

 bred November 5, 1899, while Nora was not bred until 



