112 Indianapolis Biochemical Meeting: Ahstracts [Sept. 



Effect of the Quantity of Protein Ingested on the Nutrition 



of Animals 



IV. ON THE CREATIN OF FLESH OF SWINE AND LAMBS 

 W. E. JOSEPH AND A. D. EMMETT 



(Laboratory of Physiological Chemistry, Department of Animal 

 Hushandry, Univcrsity of Illinois, Urbana, III.) 



The pigs in this experiment were the same as those described 

 by Carroll and Emmett^ in their study of the physical constants of 

 fats. The lambs were the same as those described in paper II of 

 this series (p. iio). The ham, Shoulder, and side cuts were used 

 in the case of the pigs and the leg of mutton cuts from the lambs. 



From the chemical data, the per cent. of creatin in the water- 

 and fat-free flesh of the ham and side cuts and also of the composite 

 of the flesh of the ham, Shoulder, and side cuts shows, in general, 

 sligftt tendencies toward variations with the amount of protein fed. 

 The percentage values for the Shoulder cut, on the other band, show 

 the opposite tendency, the medium and high protein-fed lots being 

 nearly the same and the low one distinctly greater. In the flesh of 

 the leg of mutton, the average values for the three lots are prac- 

 tically the same. 



Considering the per cent. of creatin nitrogen in the soluble 

 nitrogen, a uniform Variation is found in the cuts from the swine. 

 The greatest value is found in the high protein lot and the least 

 in the medium protein lot. In the leg of lamb-cuts, there is a 

 uniformly decreasing average percentage with decreasing amounts 

 of protein fed. The maximum differences in both cases are less 

 than the difference between individuals within the lots. 



On the whole the data seem to indicate slight differences between 

 the three lots. However, the differences between individuals within 

 the lots are such that no definite conclusions can be drawn at this 

 time as to the effect of the quantity of protein in the feed on the 

 creatin content of flesh. Differences between indivduals seem to be 



^Carroll and Emmett: Proceedings of the American Society of Biological 

 Chemists, 1911, ii, p. 17; Journal of Biological Chemistry, 1911, ix, p. xxiii. 



