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Effects of Different Amounts of Protein on the Growth of Beef Calves

North Dakota Agricultural Experiment Station

Abstract

Conclusions: The data so far as studied would seem to justify the following observations and conclusions:

1. The steers made very nearly the same average daily gains on both high- and low-protein rations, the advantage being slightly in favor of the high-protein steers.
   
2. The protein and ether extract was noticeably less digestible in the low-protein rations.
   
3. The rations based on Armsby's tables actually supplied only 73 and 82 per cent of the intended amounts of digestible protein and 70 and 77 per cent of net energy, respectively, in the low- and high-protein rations.
   
4. The steers on the low-protein rations made appreciable and, in some instances, "normal" gains in protein on rations approximating the theoretical minimum of protein.
   
5. The steers on the high-protein rations in some instances stored less protein than those on the low-protein rations, and, in general, failed to store appreciably more protein even with a liberal supply.
   
6. The indicated theoretical minimum of protein appears to mark a limit below which it is not advisable to go in supplying protein to growing calves.
   
7. The steers used in these trials in general showed no distinct differences at the end of the trials that could be attributed to the rations consumed.
   

¹ These experiments were conducted by the animal nutrition section of the Department of Animal Husbandry in cooperation with the Department of Agricultural Chemistry. In the latter department, the work has been successively in charge of J. W. Ince, L. T. Anderegg, and T. H. Hopper.