Compensatory nitrogen retention in growing pigs following a period of N deprivation.
1. Semi-synthetic diets, with dried microbial cells (Pruteen) as the nitrogen source, were used to measure N retention in 50 kg pigs given different combinations of N intake involving periods of deprivation and enhanced supply. 2. Metabolic faecal N losses were 1.92 g/d (1.26 g/kg dry matter eaten) and endogenous urinary losses were 3.96 g/d for pigs given an N intake of 6.9 g/d. 3. Compensatory N retention averaging 4.2 g extra N/d was observed in pigs given enhanced N supply by diets providing 31.0, 60.4 and 93.4 g N/d. In some instances enhanced N retention was maintained for 22 d. 4. Pigs given enhanced N supply by extravagant N intake did not maintain the compensatory response which had been evident initially.
Tullis
J B
JB
Department of Agriculture, University of Edinburgh.
Whittemore
C T
CT
Phillips
P
P
D000818:Animals; D004044:Dietary Proteins / Q000494:pharmacology; D004063:Digestion; D004734:Energy Metabolism; D008297:Male; D009584:Nitrogen / Q000172:deficiency* / Q000493:pharmacokinetics; D013552:Swine / Q000254:growth & development / Q000378:metabolism*
D004044:Dietary Proteins; D009584:Nitrogen