Public Tests of Pure-bred Dairy Cows. 



425 



elimination the net loss of about $4 for each of the poorest cows the 

 first year was changed to a gain of $17 per head for the 5 poorest 

 animals in the herd during the fifth year. 



Comparative returns from profitable and unprofitable cows. 



* Loss. 



Fraser of the Illinois Station 1 reports a cow in the Station herd 

 that in 12 years gave 87,102 Ibs. of milk, containing fat sufficient to 

 make 4,318 Ibs. of butter. During 3 years one cow gave 11,390 Ibs. 

 of milk annually, containing 405 Ibs. of fat, and returned $42.60 per 

 year over cost of feed. Another with the same feed and care gave 

 in the same time only 3,830 Ibs. of milk annually, containing 138 Ibs. 

 of fat, and failed by $5.62 per year of paying for her feed. 



689. Unreliability of short tests. Glover of the Illinois Station 2 

 found 2 cows in an Illinois dairyman's herd whose best weekly rec- 

 ords and actual annual returns during 3 years were as follows: 



Best 



and annual returns of two cows. 



1 Cir. 106. 



2 Cir. 84. 



