Mar. 25, 191S Energy Values of Feeding Stuffs for Cattle 



481 



axid by hominy chop, on the other hand, appear to have affected chiefly 

 the metabolism of the animal when lying. 



INDmDU.'VL DIFFERENCES 



Attention was called on pages 460-461 to the existence of individual 

 differences in the effect of the feed on the ratio of the standing to the lying 

 metabolism. These differences seem in some instances to extend also 

 to other factors of the total heat increment. While the single results 

 are more or less variable, this fact seems to be brought out clearly in the 

 averages. The most striking example is afforded by the animals A and 

 B in experiments 190, 200, and 207, for which the following averages 

 may be computed, showdng the heat increments per kilogram of feed to 

 have been distinctly greater with steer B than with steer A. This is, 

 of course, the converse of the conclusion recorded in an- earher publica- 

 tion (10). 



Average heat increments of steers A and B per kilogram of dry matter 



No such distinct differences were observed between the other animals, 

 which, however, were all of similar type. While steers C, E, and F 

 showed an increased effect upon the standing metabohsm in the order 

 named the difference in the metabolism of the animals when lying 

 shows on the average an approximately equivalent decrease, so that 

 no material difference in the total effect resulted. 



SUMMARY 



Tables X and XI include the results of all of our experiments which 

 have been so far computed as to permit their discussion. In seeking to 

 derive from the recorded results for the increased energy expenditure 

 consequent upon the consumption of certain feeding stuffs general 

 averages which may, with the reservations made on previous pages, afford 

 a basis for estimating the energy values of classes of feeding stuffs and of 

 mixed rations, a certain degree of freedom of choice and the exercise 

 of the judgment of the experimenters seems warranted. Of our results, 

 those on clover hay in experiment 186 appear to us particularly ques- 

 tionable. In one period the animal did not lie down during the entire 

 48 hours, while in two other periods the time spent in lying was nuich 

 less than normal. Furthermore, there was a considerable difference 



