404 



Feeds and Feeding. 



these facts the thoughtful dairyman will not regard the dairy cow 

 an idler. 



617. Relation of live weight to yield. The relation of live 

 weight to yield of milk and fat by cows is illustrated in the fol- 

 lowing table by Woll, 1 which gives a summary of the results of 

 Breed Test !No. 1, conducted at the World's Columbian Exposi- 

 tion, Chicago, 1893, the data given being the average and total 

 figures for seventy -five animals. (See Chapter XXVII, Part I. ) 

 The cows are grouped according to their live weight into three 

 sets, the first including the lightest animals, the second represent- 

 ing the medium, and the third the heavy cows. The scale of prices 

 for feeds is of course arbitrary, but being the same for all ani- 

 mals it serves the desired purpose. 



Relation of average live weight of cows to yield of milk and fat 

 Columbian Dairy Test No. 1, fifteen days Woll. 



The different groups include the same number of cows of each 

 breed, so that the influence of breed is practically eliminated. 

 The results show that the lightest cows produced less milk and fat 

 than the other two groups, the cost of feed also being less. The 

 yield of milk and fat per 1,000 pounds live weight was great- 

 est with the light cows and least with the heaviest cows. Calcu- 



1 Hoard's Dairyman, March 30, June 22, 1894. 



