ANIMAL PRODUCTION. 



J''(f'('rl 1)/ liidtiiiij tijton. the tlii/eslihllili/ nf jiro/i'in. 



81)1 



Mi'iulow liny . ... 

 I'nlm-nut cake . . 

 ('otton-si'od nic'Ml 



Peanut meal 



Cocoanuteake... 



Rvo 



Wheat 



Vetch 



Maize 



Peas 



Brcncrs' (,'rains.. 

 Disfillerv refuse . 



Total 



nitrogen, ^f 



in fresh "^„P" 



feed *''^'®" 



^^'^^- ' feed. 



Coefflclent of digestibility of protein— 



cr cctit. 

 1.750 

 2.924 

 7. 296 

 7. 9 16 

 3.441 

 1.669 

 2. 186 

 4. 534 

 1.817 

 3. 968 

 3. 116 

 4. 991 



' cent. 

 74.3 

 82.8 

 94.8 

 %.7 

 91.8 

 92.4 

 95.9 

 95.3 

 88.6 

 95. 5 

 76. 2 

 60.4 



Of feed 



dried at 



40°. 



Per cent. 

 70.9 

 80.7 

 93.0 

 95.2 

 90.9 

 89.0 

 92.0 

 92. 9 

 83.7 

 93.5 

 ■ 75.8 

 56.1 



Of feed 



dried at 



60°. 



Per cnit. 

 67.4 

 81.6 

 88.5 

 91. 8 

 90.8 

 88.7 

 92.1 

 93.9 

 84.5 

 93. 2 

 74.2 

 .59.1 



Of feed 



dried at 



100°. 



' ecu I. 

 61.6 

 80.1 

 91.5 

 93. 7 

 90.4 

 S8. 7 

 91.5 

 94.2 

 85. 

 93. 4 

 58. 3 

 44.8 



The results atv suniinari/A'd as follows: Dfving diiniriiHlu's the di^estiliiiify of i)ro- 

 tein, tlK' (,'ffi'ct iH'iiijij proportional to the degree of heating. If tiie temperature 

 enii)loye(l is not over (>0°, the digestibility is not markedly lowered. Heating lowers 

 the digestibility of the protein of materials which have ])een heated in the process 

 of manufacture, such as dried brewers' grains and distillers' grains. 



Comparative tests of digestibility of protein by artificial and natural 

 methods, K. vo.\ Da.misski {/wnig. Diss., Univ. Breslau, J90S, pp. HO). — The litera- 

 ture of the subject is sununarized at considerable length and experiments reported 

 which compare the digestibility of jirotein by the Stutzer and the Kiihn methods 

 with the results obtained in natural digestion experiments with sheep. 



The rations testetl included meadow hay alone and with wheat bran, clover hay 

 alone and with peanut cake, and meadow hay with dried beet chips. One of the 

 ])oints especially considered was the effect of heat employed in drying feces u[)on 

 the protein present, and in this connection some tests were also made with horse and 

 cow feces. The author's general conclusion is that natural and artifitual digestion 

 experiments do not give absolutely concordant results, since certain variations are 

 nnav(>ida})le. The smallest discrepancies were oljserved when the metabolic j)rod- 

 ucts in the feces were determined by the Stutzer method with pepsin and tryjisin. 

 He l)elieves, therefore, that the Stutzer metliod is the most satisfactory method for 

 determining coefficients of tligestibility in artificial digestion exi)eriments. 



Nimierous tests are included in the above investigation on the effect of different 

 amounts of digestive ferment and the effect of the time element on the reaction. 



Concerning- the nitrogen content and the solubility in pepsin-hydrochloric 

 acid of the protein of fresh and dried sheep manure, C. Bkgek {Zlschr. I'lii/siul. 

 Chrm., 40 (I90-1), No. 3-4, J>p. 176-181). — In the experiments reported sheep were 

 fed in the different periods hay, hay jjIus i)eanut oil, hay plus straw, a fat-free mixed 

 ration, and a mixed ration containing oil. The amount of digestibU' iirotein in the 

 fresh and the dried feces was determined by tlus pepsin-hydrochloric acid method. 

 It was found that considerably higher values were obtained with the fresh than 

 with the dried feces. The author believes that it is best, therefore, to retain the 

 usual method and use fresh feces for the determination of the nitrogenous material 

 insoluble in pepsin-hydrochloric acid. This is especially important in determining 

 the coefficients of digestibility of a mixed ration. 



Fate of proteids introduced through the alimentary canal and otherwise, 

 C. Oi'PKNiiEi.MEK (Beitr. ('hem. Physiol, v. I'allioL, 4 {HJO.3), pp. 263-278; ahs. in Jour. 

 Chem. Sue. [Londo7i'], 84 {1903), No. 493, II, pp. 738, 75.9).— Experiments with rab- 

 })its showefl that when foreign proteids (serum from other animals and egg white) 

 were injected intravenously or intraperitoneally, they were directly utilized and only 



