title: Simultaneous effect of initial weight, initial crowding, temperature and O2 concentration on the nutritional use of food by rainbow trout (Oncorhynchus mykiss).
abstract: The simultaneous effects of initial weight, initial crowding, temperature and O2 concentration on the following ratios: relative growth rate percent (RGRP), feed efficiency (FE), protein efficiency ratio (PER) and protein productive value (PPV) were studied in the rainbow trout. Multivariant equations were obtained for each of the mentioned indices. The joint effects of these factors were evidenced by means of a multiple correlation analysis. The influence of temperature and, to a lesser extent, of crowding, and O2 concentration on the nutritional use of food by the trout was demonstrated, their fundamental dependence on factors extrinsic to the animal being underlined. The non proportional changes in PER and PPV as temperature rises revealed that an increasing part of the ingested aminoacids were used for synthesis of fat, non for proteins edification.
authors.affiliation: Department of Physiology and Pharmacology, University of Murcia, Espinardo, Spain.
authors.forename: F J
authors.initials: FJ
authors.lastname: Martinez
authors.forename: M P
authors.initials: MP
authors.lastname: Garcia
authors.forename: M
authors.initials: M
authors.lastname: Canteras
authors.forename: J
authors.initials: J
authors.lastname: De Costa
authors.forename: S
authors.initials: S
authors.lastname: Zamora
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001835:Body Weight / Q000502:physiology*; D003441:Crowding; D004044:Dietary Proteins / Q000008:administration & dosage / Q000378:metabolism; D010100:Oxygen / Q000494:pharmacology*; D013696:Temperature; D014337:Trout / Q000502:physiology*; D015430:Weight Gain
chemical_list: D004044:Dietary Proteins; D010100:Oxygen