U6 IvKrouT oi<' Depautment of Animal Husbandry of the 



With hut little cliange of protein. — There were only 15 records 

 when but little change of protein occurred. There was a falling 

 off in milk yield greater than usual. The gain in live weight 

 was at the rate of about one-half pound per day before and at 

 about one-third pound per day after the change. 



With some reduction of protein. — The average from 85 records 

 when there was a reduction of protein shows something more 

 than the normal shrinkage in milk flow (C, Table XX). The 

 rate of increase in live weight, over a pound per day before the 

 change of ration, was about half as much afterward, 



KEMARKS. 



Tlie proportional increase or reduction of the total nutrients 

 in corresponding groups was not always regular but varied con- 

 siderably. In general the milk flow increased most or dimin- 

 ished least when the highest percentage of increase was made in 

 the amount of total nutrients, without regard to the protein 

 content. Among the groupings of records in which the amount 

 of nutrients was reduced, the most rapid shrinkage in milk 

 flow occurred generally when the percentage reduction of nutri- 

 ents was greatest, although this usually was associated with a 

 reduction of the protein. 



A statement of the general results accompanying changes 

 which related to different amounts of total nutrients, is given 

 in the summary. 



THE ENERGY OF THE RATION. 



As a rule, the fuel value of the ration changed in about the 

 same proportion as the amount of total nutrients, but not 

 always. Occasionally quite a different relation was caused by 

 the unusual proportion of fat existing in some of the grain 

 products fed. At the time many of these records were made 

 cottonseed meal and some gluten feeds contained over 13 per 

 cent, of fat, gluten meals from 12 to 21 per cent., and the ground 

 flaxs-eed about 38 per cent. 



