348 THE FEEDING OF ANIMALS 



bran against potatoes, tallow, and corn meal. As would 

 be expected, the development of the two lots of pigs was 

 in these cases greatly unlike. Those fed on the nitrog- 

 enous rations contained more blood than the other; 

 their organs, such as the kidneys and liver, were much 

 larger in proportion to the weight of the body, the bones 

 were stronger, and the proportion of muscle in the car- 

 cass was mu6h greater. The differences were very marked. 

 It should not be forgotten, however, that these were 

 extreme and somewhat unusual rations. It is doubtful 

 whether there are generally sufficient differences in the 

 food combinations of ordinary practice to occasion such 

 marked differences of body structure. 



At the Cornell University Experiment Station lambs 

 fed on oil meal and bran made a much more satisfac- 

 tory gain than did those the grain ration of which was 

 corn meal alone, but the photographs of the carcasses do 

 not show a larger proportionate growth of muscular tissue 

 from the nitrogenous foods. 



An elaborate study of the influence of the ration 

 upon the composition of the carcass was made at the 

 Maine Experiment Station, where two lots of steers 

 were fed from calfhood on rations widely unlike in their 

 nutritive ratio. The hay fed was the same for both lots. 

 The grain food of one lot was oil meal, wheat bran, and 

 corn meal, and of the other lot corn meal, mixed with a 

 minimum proportion of wheat bran, the nutritive ratios 

 being respectively 1 : 5.2 and 1 : 9.7. One animal from each 

 lot was killed at the end of seventeen months of feeding 

 and the others at the end of twenty-seven months, the 

 entire bodies of the four steers, exclusive of the skins, 

 being analyzed. It was found that the composition of 

 the animals did not differ materially. (See Table LXXV.) 



