34 BULLETIN 1166, IT. S. DEPARTMENT OF AGRICULTURE. 
when digested with emulsin. No hydrocyanic acid was detected 
when the product was digested with water alone, an indication that 
the enzyme was destroyed during the process of preparing this 
commercial sample. 
In the feeding tests conducted in the department the animals ate 
the dried apple pomace with evident relish and suffered no ill effects 
from it. Pound for pound of dry matter consumed, the moistened 
apple pomace seemed to be slightly more efficient as a milk producer 
than good corn silage. 
Dried apple-pectin pulp, the residue of apple material from which 
a large part of the pectin and other substances rendered soluble by 
treatment with boiling water, as well as substances extracted by cold 
water, have been removed, is a semiconcentrated feed of the same 
type as dried apple pomace and dried beet pulp. As a rule, it con- 
tains more crude protein and ether extract and less available car- 
bohydates than dried apple pomace. Because of the thorough cook- 
ing to which it is subjected, pectin pulp is believed to be a safe food 
for stock, in spite of the fact that the apple-seed tissues present in the 
pulp contain amvgdalin. 
The total acidity of the dried pectin pulp was slightly higher 
than that of the dried pomace, while the, " strength " of its acid- 
reacting substances was somewhat lower. On the other hand, the 
dried beet pulp used in one of the feeding experiments had high acid 
ionization values. While the total titrable acidity of extracts of the 
beet pulp was relatively low, the ionization of the acid appeared to be 
over 30 per cent in an 80 per cent alcohol solution and 7.5 per cent 
in a water extract. 
Pound for pound of dry matter, pectin pulp seemed to be inter- 
mediate between good corn silage and beet pulp as a succulent feed 
for cows in lactation. 
The palatability of the dried apple-pectin pulp varied decidedly at 
different times and with different cows. The addition of molasses, 
for which it is a good absorbent, increases its palatabilit} T . 
The work here reported indicates (1) that the valuable extractives 
of apple pomace, such as sugars and pectins, should be utilized in 
the preparation of jelly stock, prepared pectin, or other human food- { 
stuffs, and all surplus apple pomace dehydrated at a moderate tem- 
perature; and (2) that all surplus dried pomace and other suitable 
apple residues, such as pectin pulp, should be utilized as stock food. 
All seeds should be either separated from the apple pomace which 
is to be used directly as a feeding stuff, to obviate any danger to the 
stock from hydrocyanic acid, or, if this be impracticable, the pomace 
should be thoroughly heated to destroy the emulsin contained in 
the seeds. 
The seeds might serve as an additional source of profit by sale to 
nurserymen or by distilling the volatile oil from them. 
The dried apple pomace and pectin pulp should be moistened 4 
before being fed because of their capacity to absorb large quantities 
of water. 
Concentrates high in protein content should be included in the 
rations in which apple pomace or apple-pectin pulp supplies the 
succulence. 
