GROWTH 



405 



In the light of Fingerling's results upon suckling calves 

 (466), however, there can be little doubt that the protein supply 

 in these experiments was unnecessarily great, especially with 

 the older animals. 



The writer 1 has elsewhere discussed some of the earlier live 

 weight results bearing upon the protein supply of immature 

 fattening cattle which seem to indicate much higher require- 

 ments than might be deduced from the actual gains of protein 

 at the several ages. Those results are here tabulated in a 

 slightly altered form and with the addition of a subsequent 

 experiment by Schneidewind. 2 The summary of course repre- 

 sents to a degree the judgment of the writer and the figures are 

 to be interpreted as indications rather than as determinations. 



TABLE 96. ESTIMATED PROTEIN REQUIREMENTS OF CATTLE 



The foregoing estimates correspond in general with the pro- 

 tein requirements for growing cattle as formulated in the Wolff- 

 Lehmann and Kellner feeding standards (790-793) . In experi- 

 ments upon two steers, directed principally to other questions, 

 Armsby and Fries 3 observed a normal rate of increase in weight 

 upon rations containing amounts of digestible protein much 

 smaller than are called for by current feeding standards, although 

 still in excess of the estimated normal gain of protein for the cor- 



1 U. S. Dept. of Agr., Bur. Anim. Indus., Bui. 108 (1908), pp. 60-65. 

 2 Landw. Jahrb., 36 (1907), 687. 

 . 3 U. S. Dept. of Agr., Bur. Anim. Indus., Bui. 128 (1911), pp. 88-90. 



