Table n. Average Rations Per 1000 Kilograms Live Weight. 



Energy Requirements. 



The rations of the scrub steer contained in the earlier periods 

 of the experiments somewhat less available energy than the stand- 

 ards of the dairy breeds call for and a somewhat larger amount dur- 

 ing the latter periods. The differences, however, are not very marked. 

 The pure-bred steer consumed relatively less feed than the 

 scrub and consequently the available energy of his rations is notably 

 less in the earlier periods than that called for by the standards for 

 beef breeds and somewhat less in the later periods. On these rations 

 both steers made on the whole quite similar gains per head, which 

 were entirely satisfactory from a practical standpoint. The scrub 

 steer being the lighter animal, his gains were relatively greater, 

 although, as has already been shown, this greater relative gain seems 

 to have had a lower energy value per unit. The pure-bred steer, 

 on the other hand, seems to have had a relatively low maintenance 

 requirement and possibly the average beef animal would require 

 more feed for this purpose than did this one. On the whole, the 

 results upon these two animals indicate that for simple growth 

 without material fattening, Kellner's standards as regards available 

 energy might be somewhat reduced. 



Protein Requirements. 



As regards the protein requirements, we find a striking con- 

 trast between our rations and the accepted standards. Our two 

 steers made entirely satisfactory gains on rations whose digestible 

 protein ranged in the case of the scrub steer from 70 to 95 per cent, 

 of the formulated requirements of the dairy breeds and in the case 

 of the pure-bred steer from 50 to 70 per cent, of those of the beef 

 breeds. The difference is greatest at the earliest ages and gradually 



(21) 



