170 



EXPERIMENT STATION KECORD. 



matter of cereal grains over that of coarse fodders. The carbohydrates 

 in a number of different feeding stuffs is reported: 



CarbohyJirates in dry matter of several feeding stuffs. 



Sugars 



and 



starch in 1 



Digesti- 

 bility of 



tract. t-xtract. 



Cotton-seed meal 



Linseed meal (old process) . 

 Linseed meal (new process). 



Gluten meal 



Buffalo gluten feed 



Davenport gluten feed 



Diamond gluten feed 



Joliet gluten feed 



Peoria gluten feed 



Malt sprouts 



Buckwheat middlings 



Wheat bran 



Wheat middlings 



Hominy feeds 



HO dairy feed 



Oat feed 



Victor feed 



Chop feeds 



X oat feed 



" ]Many of the materials mentioned above when compared with the grains from 

 which they are derived show a depletion of sugars and starch and a corresponding 

 relative increase in the nitrogen-free extract of the less valuable compounds. This 

 is especially true of the wheat offals, the gluten feeds, and the oat feed mixtures. In 

 the case of the one sample of gluten meal examined the starch still constituted a 

 large proportion of the nitrogen-free extract. The chop feeds and other similar 

 combinations contain as a rule qtiite a proportion of corn, that furnishes nearly all 

 the starch which is found in these mixtures. . . . 



"These facts are in harmony with the outcome of digestion experiments, from 

 which we learn that the nitrogen-free extract of the whole grains is much more digest- 

 ible than that of most of the manufacturing wastes which come from them. . . . 



" Some 'mixed feeds' apparently are compounded and advertised on the assump- 

 tion that feeding stuffs are to be compared in value solely on the basis of their 

 percentage of protein and fat. This is a false basis. The quality of the accompany- 

 ing carbohydrates must always be considered. For instance, it would not be difficult 

 to simulate the composition of corn meal or of wheat middlings by mixing oat hulls 

 with some of the old-style linseed meal, adding a little crushed linseed to make up 

 the deficiency (if fat. But would the mixture equal corn meal in value? By no 

 means. In one case the protein and fat would be associated with woody fiber in 

 large proportion, and in the other case with little else than starch. The net value of 

 the corn meal would be much above that of the mixture as measured liy the extent 

 and labor of digestion. ' ' 



The various oat feeds, proprietar3% and other mixed feeds are dis- 

 cussed at some length and appear, in the authors' opinion, to contain 

 an undue proportion of crude fiber, the proportion of oat hulls being 

 larger than the oat kernels present. 



"Some of them must contain not less than 50 lbs. of oat hulls per 100 ll)s. . . . 



"In certain brands an amount of some highly nitrogenous feeding stuff like cotton- 

 seed meal or gluten meal is found, the object of its use being to bring up the protein 

 content to the standard of wheat bran. This certainly improves the feed, ):)ut at the 



