682 



NUTRITION OF FARM ANIMALS 



Waters l in experiments on growing pigs has shown in a striking 

 manner the practical significance of Osborne and Mendel's results. 

 In each of the four trials reported, one lot of animals received only 

 maize. The others were given maize with the addition of ash in- 

 gredients, either by direct additions of salts or in the form of the so- 

 called protein-free milk, while still others received an addition of 

 complete proteins, as nearly ash-free as possible, derived in some 

 cases from blood and in others from milk. The growth of the lots 

 receiving only maize was either very slow or practically zero and the 

 same was true when ash was added, showing that the failure to grow 

 was not due to a lack of mineral matter. When, however, com- 

 plete proteins were added to the maize, steady and normal growth 

 took place and comparative analyses of the carcasses showed a cor- 

 responding storage of body protein by the animals. The total re- 

 sults as to live weights were as follows : 



TABLE 212. INFLUENCE OF NATURE OF PROTEIN SUPPLY ON GROWTH 



OF PIGS 



1 Proc. Soc. Prom. Agr. Sci. (1914), p. 7. 



2 Approximate. The exact initial weights are not given in the report cited. 



