666 



EXPEEIMENT STATION EECOED. 



tors has been adapted by the author to respiration experiments of short dura- 

 tion in which the respiratory quotient is measured. This form of apparatus is 

 portable and a respiration chamber is not required. 



The apparatus is so arranged that the subject breathes through nose pieces 

 connected with three-way valves. A continuous air current is maintained by 

 means of a blower. Carbon dioxid and water are removed from the expired 

 air by means of soda lime and sulphuric acid, and oxygen is added to the air 

 before it enters the lungs, the apparatus being of the so-called closed-circuit 

 type. 



Check experiments in which ether was burned and comparative experiments 

 with the respiration calorimeter indicate that the method is accurate. 



The Boston respiration calorimeter, W. Falta {Wiener Klin. Wchnschr., 

 22 (1909), No. 16; ahs. in Biochem. CentW., 8 {1909), No. 17-18, pp. 775, 776).— 

 A descriptive article with results of experiments on diabetic patients conducted 

 by the author and by F. G. Benedict. 



ANIMAL PRODUCTION. 



Further investigations on the utilization of nonproteid nitrogen com- 

 pounds in feeding stuffs, A. Morgen, C. Beger, and F. Westiiausser {Landw. 

 Vers. Stat., 71 {1909), No. IS, pp. 1-170). — These experiments were carried 

 out on a plan similar to those previously reported (E. S. R., 20, p. 975), in 

 which a portion of the protein in the ration fed to milch sheep and goats was 

 replaced by amid extracts of malt sprouts, carbohydrates, asparagin, and am- 

 monium acetate. 



Additioual substitutes used in the later experiments included amid extracts 

 from grass and from beets, ammonium tartrate, and ammonium phosphate. 

 The basal rations consisted of hay, beet chips, straw, gluten, starch, menl, sugar, 

 and peanuts. During the protehi period about 2.33 kg. of crude protein was fed 

 per 1,000 kg. live weight, of which about 3 per cent was nonproteid. In the 

 amid periods the nonproteid nitrogen varied from 28 to 44 per cent of the crude 

 protein. In the carbohydrate period the crude protein was 1.533 kg., but the 

 amount of pure protein was the same as in the amid period. For the study 

 of milk production 13 sheep and 8 goats, and for the study of digestibility 6 

 wethers, 7 milch sheep, and 2 milch goats, were used as experimental animals. 



The effects of protein substitutes on the yield of milk were similar to those 

 previously obtained, us shown by the following table: 



Average yields of milk and milk solids and percentage of milk fat with different 

 protein substitutes as compared tvith the yields and fat percentage on a pro- 

 tein ration. 



Num- 

 ber of 

 ani- 

 mals. 



Kind of 

 animal. 



Ration substituted. 



Relative 

 percent- 

 age of 

 fat. 



Sheep .. 

 ...do.... 

 ...do.... 

 ...do.... 

 ...do... 

 ...do..., 

 ...do..., 

 ...do... 

 ...do... 



Goats.. 

 ...do... 

 ...do... 

 ...do... 

 ...do... 

 ...do... 



Ammonium acetate in the food 



Ammonium acetate in the drink. . . 



Ammonium tartrate 



Asparagin 



Amid extract of malt sprouts 



Amid extract of grass 



Amid extract of beets..., 



Carbohydrates 



No substitute 



Ammonium acetate 



Ammonium phosphate 



Amid extract of malt sprouts 



Amid extract of grass 



Amid extract of beets 



Carbohydrates 



Per ct. 

 95.6 

 95.7 

 76.4 

 83.9 

 88.9 

 96.3 



121.3 

 94.3 

 88.0 



107.1 

 80.6 

 89.4 



127. 2 



119.7 

 92. 9 



