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The Use of Urea in Rations for Dairy Cows under Hawaiian Conditions^*

Department of Animal Husbandry, Hawaii Agricultural Experiment Station, Honolulu, Hawaii

ABSTRACT

Four double change-over urea-feeding trials involving twenty-six Holstein-Friesian cows in eighty-six cow-periods are described. The conclusions are as follows:

1. The dairy cow is able to utilize nitrogen from urea in the production of milk, but apparently not as efficiently as the nitrogen derived entirely from plant sources.
   
2. Less milk was obtained when urea was fed whether the daily in take was 0.48 pound or 0.24 pound. These amounts provided 36 per cent and 19 per cent, respectively, of the total crude protein equivalent intake.
   
3. The feeding of cane molasses in amounts to make up 25 per cent of the concentrate mixture had no detrimental effect upon the synthesis of protein from urea in the rumen.
   

^* Published with the approval of the Director as Technical Paper No. 141 of the University of Hawaii Agricultural Experiment Station.