450 The Digestibility of Dried Yeast 



It will be noticed that with neither sheep was it possible to measure 

 the digestibility of the ether extract and crude fibre of the dried yeast 

 owing to the very small proportions in which these ingredients were 

 present. For the rest the agreement between the two sheep is eminently 

 satisfactory and the average indicates a very high order of digestibility, 

 despite the apparently "low grade" quality of the sample. 



The results compare favourably with those obtained by Honcamp^ 

 using material containing 56-1 % of crude protein. This material gave 

 digestion coefficients as follows : — organic matter 81-5 % ; crude 

 protein 86-6%; nitrogen-free extractives 81-5% and ether extract 

 38-2 %. 



The low figure for the ether extract is perhaps doubtful, but in any 

 case is of little significance since dried yeast is extremely poor in oil. 



Eecent measurements^ of the digestibihty of dried yeast by the 

 human subject indicate a very low order of digestibility, but it is clear 

 from the results given above that this is not the case with sheep, and 

 therefore presumably with cattle. On the contrary dried yeast must 

 rank with the most highly digestible foods used on the farm. 



^ F. Honcamp, et al. Lan/]ivirts. Vcrsuchsstal. 73, p. 271. 

 2 C. Funk, et al. Journ. Biol. Chem. 27 (1!)16), 173. 



{Received February 22nd, 1917.) 



