136 PRINCIPLES OF FEEDING FARM ANIMALS 



amounts of protein supplied by some of the older feeding 

 standards, such as the WolfT-Lehmann, are greatly exag- 

 gerated. The results of more modern investigations indicate 

 that, in the case of immature animals, no more protein is re- 

 quired for fattening than for growth. Hence, no more protein 

 is recommended for immature fattening animals than for grow- 

 ing animals. But little more protein is required for fattening 

 mature animals than for the maintenance of such animals, 

 provided the excess of carbohydrates does not cause a de- 

 crease in the digestibiUty of the ration. It has already 

 been explained that if the nutritive ratio of the ration is 

 wider than 1 to 10 or 12, the digestibihty will be decreased. 



For fattening immature cattle no more protein is recom- 

 mended than is suppUed by the standards for growing cattle. 

 The Henry-Morrison and the Haecker standards for growing, 

 fattening steers are probably not far from the truth. In- 

 vestigations with fattening mature cattle indicate that 1.0 

 11). of digestible crude protein per 1000 pounds live weight 

 is sufficient. 



For the energy, carbohydrate, and fat requirements of 

 fattening cattle, we can do no better than recommend 

 the Armsby, Wolff-Lehmann, Henry-Morrison, or Haecker 

 standards. 



Late experiments indicate that 0.15 pound or even less 

 of digestible crude protein per 100 pounds live weight is 

 sufficient for mature fattening sheep. For fattening lambs. 

 Bull and Emmett ^ recommend the same standard for 

 protein as given in Table 12 for growing lambs. From 1.8 

 to 2.0 therms of net energy per 100 pounds live weight should 

 be sufficient for fattening. 



1 III. Agr. Exp. Sta. Bui. 1G6. 



