VALUE OF CORN BRAN FOR MILK PRODUCTION. 145 



As in all feeding experiments, a sufficient preliminary period was al- 

 lowed at the beginning of each trial for the cows to become accustomed 

 to the rations, and for their alimentary tracts to become emptied of what- 

 ever food they may previously have been receiving. For the same reason 

 a transitional period was allowed between the two halves of each experi- 

 ment. These periods were of at least ten days' duration. The exact 

 dates are given in Table II. 



The amounts of hay and grains fed the various cows daily were care- 

 fully calculated for each animal, on the basis of its milk and maintenance 

 requirements,^ and from personal knowledge of the particular animal's 

 appetite. 



The general care and management of the animals, as well as the methods 

 of sampling milk, hay and grain, were similar to those already described 

 in the foregoing experiments. The hay which was used in the rations 

 was raised on the experiment station farm, and was of average uniformity 

 and good quality. All the grains were of standard quality. The daily 

 and total amount of each feed per cow may be found in the following 

 table, as well as the average and total amounts per herd: — 



' T. L. Haeker, Minnesota Bulletin No. 140, p. 56. 



