NON-PROTEIN NITROGEN IN CORN SILAGE: A PARTIAL CHARACTERIZATION, ITS UTILIZATION IN THE RUMEN AND EFFECT UPON DIGESTIBILITY AND RETENTION OF NITROGEN IN LAMBS

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Abstract
Three trials were conducted. In trial 1, 30 samples of silage were collected from farms and analyzed. Non-protein nitrogen (NPN) contributed an average of 46.4% to the total N. Of the NPN-N, an average of 10.1% was ammonia-N, 30.4% was alpha amino-N, 1.2% was amide-N and 58.3% was not identified. Extensive variability was demonstrated among samples for all these values except ammonia-N. In trial 2, silage effluents, in which NPN-N was 95% or more of total N, were compared with urea and soybean meal as to ammonia release rates in the rumen after isonitrogenous infusions of each material. Ammonia levels after infusion of corn silage effluent were nearer to those after soybean meal infusion than those after urea infusion. In trial 3, frozen corn (low in NPN) was compared with ensiled corn in a digestion and balance trial using lambs. Nitrogen balance was not significantly different between corns but was improved by supplementing either of them with urea.
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