ROOTS AND DAIRY BY-PRODUCTS 211 



In the first trial tlie 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 T2Y 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 $1,621/2 per 100 pounds, 

 the 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. 



