1892.] PUBLIC DOCUMENT — No. 33. 15 



tion among the various kinds of grain feed for the daily diet 

 was, for obvious reasons, confined to but a few, — viz., corn 

 meal or corn and cob meal, wheat bran and gluten meal 

 (Chicago variety). (See Eighth Annual Keport, pages 

 12-15.) These articles were at any time, in sufficient 

 quantity and of good quality, at our disposal ; they all en- 

 joyed a fair reputation of fitness for milk production. 



Having made ourselves, by actual trial, to a certain degree 

 familiar with the comparative feeding effect and the special 

 economical merits of the above-stated coarse fodder articles 

 under specified conditions, it was decided to institute a neiv 

 series of feeding experiments with milch cows for the special 

 purpose of studying the feeding effect and the general economy 

 of some of our most prominent concentrated commercial feed 

 stuffs, as old and new process linseed meal, cotton-seed meal 

 and gluten meal, when fed in equal weights in place of each 

 other and in connection with the same kinds of fine and 

 coarse fodder articles. 



The results of one experiment, which was planned to 

 ascertain the comparative merits of old and new process 

 linseed meal as constituents of the daily diet of milch 

 cows, under otherwise corresponding circumstances, has been 

 already published in Bulletin 38, and in our last annual 

 report, pages 15-24. 



Three more recent experiments of a similar character, with 

 Chicago gluten meal and old-process linseed meal, with 

 Chicago gluten meal and cotton-seed meal, and with dried 

 brewers' grain and wheat bran, are reported within a few 

 subsequent pages, marked 1, 2, 3. 



1. Feeding Experiment with Milch Coivs. 



Old-process linseed meal vs. gluten meal (Chicago variety), 

 Oct. 21 to Dec. 31, 1889. 



This feeding experiment was instituted as above inti- 

 mated for the special purpose of comparing the effect of old- 

 process linseed meal with that of gluten meal on the cost 

 of feed and on the yield of milk, when fed in equal weights 

 as substitutes of each other in connection with the same 

 kinds and the same quantities of coarse and fine fodder 

 articles. Six cows, grades, served in the trial ; the observa- 

 tion lasted from ten to twelve weeks. 



