title: Metabolic utilization of diets by polyploid rainbow trout (Salmo gairdneri).
abstract: 1. Nitrogen (NH4) excretion and oxygen consumption were measured in four groups of juvenile rainbow trout (36-40 g): triploids obtained by a heat shock treatment (3n); triploids obtained by mating diploid females with tetraploid males (3n/4n); tetraploids (4n) and a diploid control (2n). 2. No differences in daily N excretion patterns and in N excretion rate measured as a percentage of N intake were detected between groups. 3. Oxygen consumption of the 2n group was significantly inferior to that of the 3n and 4n groups but not to the 3n/4n group. 4. SDA, specific dynamic action (measured as a percentage of the energy intake), ranged from 5.6 to 8.6% and was not different between groups. 5. Protein energy catabolism measured as per cent of total energy expenditure was significantly higher in the 2n group than in polyploid groups.
mesh_terms: D000641:Ammonia / Q000378:metabolism; D000818:Animals; D003433:Crosses, Genetic; D004032:Diet; D004171:Diploidy; D004734:Energy Metabolism; D005260:Female; D006358:Hot Temperature; D008297:Male; D010101:Oxygen Consumption; D011123:Polyploidy; D012487:Salmonidae / Q000235:genetics*; D014337:Trout / Q000235:genetics*
chemical_list: D000641:Ammonia