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- [31] THE USE OF BIOCHEMICAL PARAMETERS TO MONITOR THE NUTRITIONAL-STATUS OF RUMINANTS .4. PLASMA UREA-NITROGEN CONCENTRATION IN RELATION TO CRUDE PROTEIN-CONTENT OF THE DIET AMONG ANIMALS GIVEN ROUGHAGES IN RESTRICTED OR UNRESTRICTED AMOUNTS TOGETHER WITH DIFFERENT AMOUNTS AND KINDS OF PROTEIN-RICH CONCENTRATES ZIMBABWE JOURNAL OF AGRICULTURAL RESEARCH, 1984, 22 (01): : 51 - 66