ROOTS AND DAIRY BY-PRODUCTS 211 
Tn the first trial the tankage constituted about one-fourteenth 
of the total ration, and in the second trial one-tenth of the 
total ration. 
About two pounds of milk to one pound of meal were fed 
in each trial. 
The average of the two trials shows that to produce 100 
pounds of gain it required: 
375 pounds meal and 34 pounds tankage. 
390 pounds meal and 727 pounds skim-milk. 
The pigs getting tankage ate their feed quite as eagerly as 
those getting skim-milk, and continued thrifty throughout the 
experiment. 
Tankage, therefore, proved a very satisfactory substitute, 
so far as gains in weight were concerned, but, when skim-milk 
can be obtained at 15 cents per hundredweight, it is cheaper 
than tankage at prevailing prices. 
In other experiments by the writer, the results of which 
have not been published, other substances, such as linseed meal, 
“black-strap ” molasses, and tea from alfalfa hay, have been 
tried, but none of these approached tankage in efficiency as a 
substitute for skim-milk for young pigs. 
The Michigan Experiment Station also compared tankage 
with skim-milk for young pigs. The pigs on skim-milk made 
slightly larger gains, but, when skim-milk was valued at 20 
cents per 100 pounds and tankage at $1.6214 per 100 pounds, 
ihe tankage-fed pigs made cheaper gains than the skim-milk pigs. 
Garbage.—Large hotels, boarding houses, and institutions 
have much kitchen refuse, often used in hog feeding. Such ma- 
terial possesses considerable feeding value, but there are serious 
dangers connected with its use. Ordinary garbage is likely to 
contain broken glass or crockery, washing powders, lye, poisonous 
medicines, and other substances which may prove fatal to hogs. 
In addition, ptomaines may develop in fermenting garbage, and 
the hog seems to be very susceptible to ptomaine poisoning. 
