1 136 FEEDS AND FEEDING 



Table IV. — Content of digestible elements in the blood meal. 



Calculated Calculated accordiug 



accordiug to the uitrogen 



to total iusoluble in 



uitrogen hydrochloric pepsin 



Cruilf protein 65.3 % 82.6 % 



I'ure protein 63.2 82.2 



Organic matter 63.4 — 



Starch value 59-4 77-3 



The protein consisting exclusively of pure protein and being higlily 

 digestible, the blood meal forms an excellent food which should be bought 

 if not too dear. 



In conclusion, the writers say that the determination of the coefficients 

 of digestibility according to the total nitrogen should be abandoned as it 

 often leads to errors. The method based on nitrogen insoluble in hydro- 

 chloric pepsin should be adopted, or if this is found too complex, Stutzer's 

 method should be employed. 



882 - Nutritive Value and Digestibility of Wood; Feeding Experiments in Germany. — 



Haberlandt G., in ForstwisscnschaUUchcs Ccntralblutt, 3iSth Year, No. 6, pp. 275-279. 

 Berlin, 19 16. 



With the support of Messrs. Zuntz and Von der Heide of the Phy- 

 siological Institute of the Superior School of Agriculture in Berlin, and 

 that of the Prussian Ministry of Agriculture, a digestibility experiment in 

 a respiration chamber was carried out with a sheep for the purpose of 

 determining the nutritive value and digestibility of birch wood. The 

 trees were felled at the end of March, and the trunks, which were 10 to 

 15 cm. thick, were converted into very fine chips by a paper mill. The 

 microscopical examination of these chips showed that the wood was very 

 finely divided, so that the membranes of almost all the cells were 

 destroyed. The water used in preparing the chips had removed almost 

 the whole of the cell contents, in consequence of which fact the experi- 

 ment allowed of determining more particularly the digestibihty and 

 nutritive value of the cellular membranes. 



The composition of the air-dried wood was as follows : 



Water 4.56 % 



Drj- matter 95-44 



Ash 0.46 



Organic matter 94.98 



Crude protein . 0.67 



Crude fat 0.45 



Crude cellulose 32.30 



Nitrogen-free extract 61.56 



The daily ration consisted of : 450 gr. of wood, 30 gr. of wheat gluten, 100 

 gr. of molasses, 75 gr. of starch, 5 gr. carbonate of lime, and 100 cc. of a saline 

 solution. After a preparatory- period of 17 da^^s the period of experiment 



