138 MASS. EXPERIMENT STATION BULLETIN 205. 



This table shows the dried apple pomace to have almost as much total 

 digestible matter as dried beet pulp, but, as would be expected, consider- 

 ably less than corn meal. Taking the latter as 100, the pomace has a 

 feeding value of 81 and the beet pulp of 87 per cent. In other words, on 

 the basis of digestibihty, if properly fed, one would expect slightly better 

 results from the dried beet pulp and noticeably better results from the 

 corn meal than from the dried pomace. 



Net Energy Values. 



In place of digestible matter as a measurement of nutritive value, 

 Kellner and also Armsby have adopted the unit of net energy. Net en- 

 ergy means the total energy in the feed minus that excreted in the urine 

 and feces, as well as that lost in heat radiation due to the processes of 

 digestion and assimilation. Armsby expresses it in therms, the therm 

 being the amount of heat required to raise 1,000 kilograms of water 1 

 degree Centigrade. 



Feed. 



Net Energy 



in 100 Pounds 



(Therms). 



Corn meal, 

 Dried beet pulp, 

 Dried apple pomace, 



85.17 

 75.87 

 61.391 



1 Estimated according to Armsby's data for beet pulp and corn meal. 



On this basis, with corn meal as 100, beet pulp has a relative value of 

 89 and apple pomace of 72. Both the figures for digestibility and the 

 net energy values show the apple pomace to be slightly inferior to beet 

 pulp as a source of nutrition. 



Dried Apple Pomace for Dury Cows. 



The value of dried apple pomace for milk production was carefully 

 studied during a period extending from Nov. 10, 1920, to Maj^ 10, 1921. 

 The material was compared first with dried beet pulp and later with corn 

 meal, on an equal dry-matter basis. The dried pomace was fed moist in 

 both experiments, and was mixed with the grain ration shorth^ before 

 feeding. It was much relished by the cows. The beet pulp was also 

 moistened. 



The experiments were conducted by the usual reversal method, eight 

 cows being used in the first trial and twelve in the second. i The animals 

 received the usual care as described in earlier pubhcations of the station. 

 The hay was sampled three times during each half of each experiment by 

 taking forkfuls here and there, running the same through a power cutter 

 and subsamplmg. The subsamples were placed in glass-stoppered con- 



1 One cow was taken sick halfway through the experiment, and her record is therefore omitted. 



