FIPTY-SECOND ANNUAL CONVENTION 39 



get the essential building stones. An animal can take cer- 

 tain amino acids, chop off a chunk and make some of the 

 simpler ones. If a carpenter has some one by six inch 

 boards and he wants a one by three, and he has a ripsaw, 

 he can manufacture the one by three, but you must remem- 

 ber that most of the amino acids or building stones must 

 be present in the feed, and the animal can't manufacture 

 them from anything else it gets, so this pig may have all 

 the protein you can feed him in the form of corn fat, but 

 he can't grow it all. On the other hand if you give him 

 corn grain he can grow some, not very efficient, because 

 the other proteins are not so lopsided as this first protein 

 of corn. 



To show the tremendous practical application of the 

 quality of proteins in stock feeding let me give the figures 

 obtained in certain experiments carried on by our Agricul- 

 tural Chemistry Department, where they have taken young 

 pigs and put them in cages where they can analyze the 

 feed, feces and urine, and tell what is happening to the pig. 



We find when pigs are given corn protein as the only 

 kind of protein, that the pigs will be able to use for growth 

 only twenty-three per cent of the entire protein they eat; 

 on the other hand, when they are given milk protein as 

 the only protein, instead of using only twenty-three per 

 cent, the efficiency is sixty-six per cent or just about two- 

 thirds, a tremendous difference then in the quality of milk 

 protein and corn protein from the standpoint of stock 

 feeding. ? 



One of the most important facts from the standpoint 

 of stock feeding is this: that all of the cereal proteins are 

 badly balanced or they are lopsided in composition, no mat- 

 ter whether corn, oats, wheat, rye, kaffir, buckwheat or 

 anything else. All the cereals are badly balanced in com- 

 position, so you get the same results approximately with 

 wheat, oats, barley, as you would with corn. 



Now, how about mixing these proteins together? If 

 you take one of our high protein concentrates, linseed meal, 

 and test it out, you will find that, fed alone, the efficiency 

 of linseed meal is less than that of corn, being seventeen 



