RECENT AMERICAN WORK ON FEEDING STUFFS. 535 



H. Snyder and ,]. A. Iluniniol" in experiments with .steers studied 

 the dit^estibility of alfalfa hay, alone and fed with corn meal w'ith and 

 witliout a stock feed, and green alfalfa fed jilone and with barley and 

 nian<»'els. In the authors"' opinion these triiils indicate that in digesti- 

 hility alfalfa hay is equal to red-clover hay. It was more digestible 

 when fed with the grain than when fed alone. 



The Utah Station '' made artificial digestion experiments with the 

 whole plant, leaves, stalk, and How(M" of the (lolden Vine tield pea, and 

 discussed the feeding value of the ditl'erent parts of the plant and of 

 the whole plant as compared with other feeding stuli's. 



The digestibilitv and feeding value of rice bran was studied at the 

 Louisiana Station by C. A. Browne, jr.'' 



J. B. Lindsey'^ studied with sheep the digestibility of pentosans and 

 other constituents of the car})ohydrate group in feeding stuffs, the 

 conclusion being reached that pentosans were as digestible as "any of 

 the other fodder groups (except in the presence of excessive incrusting 

 substance), and the digested material is practically utilized in the 

 animal organism to the same degree as the other carbohvdrates." 



The dioestibilitv of a number of edible oils, including cotton-seed 

 oil, was studied by J. F. Moore'' with mice and guinea pigs. 



METABOLISM EXPERIMENTS. 



■In connection with digestion experiments the income and outgo of 

 nitrogen is frequently determined. This was done in W. W. Cook's 

 study of the maintenance ration of sheep and in H. Snyder and J. A. 

 Hummers stud}' of the digestibility of hog millet. 



One of the most important of recent contributions to the theoretical 

 discussions of metabolism, especially the met^ibolism of energy, is 

 H. r. Armsby's'" recent volume, entitled "Principles of Animal Nutri- 

 tion.'" which sununarizes, in systematic form, the available information 

 which lias accunudated in recent years regarding the principles of 

 animal luitiition, especially from the standpoint of energy. 



A respiration calorimeter of the Atwater-Rosa type, suitable for 

 experiments with steers, has been constructed at the Pennsylvania 

 P^xperiment Station by H. P. Armsby and J. A. Fries,^' cooperating 

 with the Bureau of Animal Industry of this Department. (See also 

 p. 51IJ.) After th(> accuracy of the apparatus had l)een demonstrated 

 by tests in wliich alcohol was burned in the respiration chamber, 



" Minnesota Sta. Bui. SO. 



'' I'tah Sta. Bill. 69. 



'• Ix)ui.>^iana Planter, :50 (H«»3), p. .S83. 



'/Ma.«.«achnsett8Sta. lipt. 1902, p. (59. 



'' Arkansas Sta. Bill. 78. 



/ rrinci]il('.« of Animal Nutrition, l»y II. I*. .\riiisl)y. New York, 190:?. 



!/ I'enuHy Ivan ia Sta. Kpt. 1902, p. 2S0. 



