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Nitrogen metabolism of animals fed a medium protein diet (10.5% cp) ad libitum with restricted water consumption was studied. During the 8-day digestibility trial, 3 groups of five animals each were subjected to 30%, 50% and 100% water supply, with concomitant jugular blood samples taken daily to monitor their hydration status. Water loss via the urine reflects the animals water intake, thus control animals voided more urine (P amount of nitrogen, in contrast to control animals that lost 2.4% nitrogen via the faeces. Inadequate drinking caused decreased excretion of urea. The improved nitrogen retention coupled with high rates of urea recycling enhances nutrients digestion and consequently the animals’ absorptive capabilities. . (Afr. J. Biomed. Res. 9: 225 – 229, September 2006) Keywords: nitrogen, water restriction, digestion, urea, absorption, animals

Nitrogen retention and water balance in animals fed medium protein diet amidst limited water supply