ROOTS AND DAIRY BY-PRODUCTS 205 



These trials probably show the maximum value of whey for 

 pig feeding. Under ordinary methods of feeding, it would 

 hardly be safe to expect quite as good returns for whey. Where 

 labor is involved in procuring the whey, due allowance must 

 be made in estimating the value of this product. 



Sweet vs. Sour Whey. Five trials made by the writer 

 failed to show any appreciable difference between the feeding 

 value of sweet and sour whey. 



Separated vs. Ordinary Whey. In an experiment con- 

 ducted by the writer, ordinary whey proved to be worth twenty- 

 five per cent more than separated whey. The separated whey 

 had been run through the cream separator to remove the fat 

 for making whey butter. 



Buttermilk. Experiments at the Ontario Agricultural 

 College and elsewhere show that buttermilk is practically equal 

 to skim-milk for feeding pigs. 



Substitutes for Skim-Milk. For young pigs just after 

 weaning, it is difficult to find anything that will take the place 

 of skim-milk. When skim-milk is not available, there is danger 

 of the pigs becoming stunted at this period of their life, 

 especially pigs, that are weaned young. The Ontario Agricul- 

 tural College conducted two trials with Swift's digester tank- 

 age and blood meal ais substitutes for skim-milk. These two 

 feeds proved nearly equal in value, and, since the tankage costs 

 much less per ton, it was regarded as the more satisfactory. 



In 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 : 



