1908.] PUBLIC DOCUMENT— No. 33. 99 



digestibility is quite necessary in order to form an accurate 

 opinion of the true nutritive value of a feed stuff. The station 

 has tested the digestibility of all of the above-mentioned feeds, 

 and intends publishing the detailed results. 



The requirements of any ready ration, either mixed at home 

 from standard by-products, or purchased in the form of a pro- 

 prietary mixture, may be briefly stated as follows : — 



1. It should be bulky, palatable, and free from mold and 

 rancidity. 



2. It should contain at least 16 pounds of digestible protein 

 in 100. 



3. It should contain substantially 70 pounds of digestible 

 organic nutrients in 100, and not over 9 per cent, of total 

 fiber. 



The results of our observations and digestion studies have 

 shown that only one proprietary feed — Biles union grains — 

 substantially conformed to the above requirements. This feed 

 contained 17.8 pounds of digestible protein, 60.7 pounds of 

 digestible organic matter and 9.6 pounds of total fiber in 100 

 pounds. The other feeds showed from 7.5 to 16.1 pounds of 

 digestible protein, from 52 to (52 pounds of digestible organic 

 matter and from 10 to 18 pounds of total fiber in 100. Most 

 of the above feeds are quite expensive as sources of digestible 

 protein, and furnish digestible organic matter at a higher cost 

 than it can be had in the ordinary standard by-products. 



The Effect of Soy Beans minus tie Oil, and of Soy Bean Oil 

 on the Composition of Milk and Butter Fat, and on the 

 Consistency or Body of Butter. 

 An experiment was in progress during the winter of 1906-07 

 to study the physiological effect of this legume upon milk and 

 butter. The experiment is one of a series planned to ascertain 

 the feeding effect of the various groups of substances — protein, 

 carbohydrates and fat — upon milk secretion in general. The 

 beans were shipped to a western oil mill to secure the removal 

 of the oil, the percentage being reduced from 16 to 8. It was 

 hoped that after the extraction the residue would not show 

 over 3 per cent., but this result was not secured. It is in- 

 tended to publish and discuss the experiment in detail at a 



