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The Non-Protein Nitrogen in Certain Dairy Rations and the Partition of Nitrogen in the Urine Produced Thereon

W. E. Krauss

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

Data are presented showing the distribution of non-protein nitrogen in dairy rations based upon clover and timothy hay, the digestibility of the non-protein nitrogen, and its utilization by cows in milk. The results of a study of the partition of the nitrogen in the urine collected while these rations were being fed are included. The following conclusions are based on these data:

1. The non-protein nitrogen in hay and silage varies greatly in different samples, presumably due to differences in stage of maturity, method of curing, and other factors. This large variation suggests that figures for true protein based on average analyses are of limited usefulness.
   
2. The albuminoid nitrogen method of the Association of Official Agricultural Chemists is of doubtful accuracy for distinguishing between crude and true protein in feedingstuffs.
   
3. Dairy rations made up of hay, silage, and grain, contain a relatively large amount of non-protein nitrogen. This nitrogen is apparently useful in meeting a part of the protein requirement of a cow in milk.
   
4. There is no difference in the protein metabolism when timothy hay or clover hay is fed, as indicated by urine analysis.
   

Also presented to the Faculty of the Graduate School of Cornell University, June, 1926, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.