Com Svbatitutes for Grotoing Pigs 331 



ing to the instructions of the maunfacturers, is generally so 

 small that no possible benefit can be expected from its use. 

 5. " Assuming that the condimental feeds are scientifi- 

 cally prepared mixtures of useful and effective ingredients, 

 and their use as directed would confer upon the animal 

 the benefits claimed, their excessive cost would pro- 

 hibit their use by the careful and economical feeder. 

 Such ingredients, which they contain and which might 

 be of benefit, any feeder can obtain and mix for at from 

 one-tenth to one-twentieth the cost of the prepared foods. 

 He would have the added advantage of knowing just 

 what drugs he was administering to his animals and could 

 give them such quantities of the needed medicines as 

 veterinary experience has shown to be necessary." 



Effect on digestion. 



Stock foods do not improve the digestibility of the 

 rations in which they are used, according to the results 

 obtained in actual digestion trials by Michael and Ken- 

 nedy at the Iowa Station.^ In this experiment four groups 

 of pigs were fed. Corn alone was given to one lot, and 

 corn and a stock-food to each of the other three lots. The 

 effect of the stock-foods on the digestibility of the organic 

 matter is shown in the following table : 



Table CLIX. — The Effect of Stock-Foods on the Di- 

 gestibility OP COHN 



> Bull. 113. 



