title: Muscle delta13C change in Nile tilapia (Oreochromis niloticus) fingerlings fed on C3-or C4-cycle plants grain-based diets.
abstract: The effects of grain-based diets from C3 or C4-cycle plants on muscle delta(13)C change process in Nile tilapia (Oreochromis niloticus) fingerlings were investigated. Two groups of sex reversal males Nile tilapia fingerlings were fed with isoproteic (32.0% DP) and isocaloric (3200 kcal DE/kg) diets, differing from each other by their delta(13)C. Muscle samples were collected and the carbon isotopic composition was measured. For C4 diet, the formula for the muscle delta(13)C change related to the intake time of a new diet was delta(13)C=-14.88-9.21e(-0.0209t) and the half-life (T) of the muscle carbon was 33.2 days. For C3 diet, the formula was delta(13)C=-25.43+8.59e(-0.0533t) with T=13 days. The C3 diet was considered more appropriate based on its palatability and consequent larger food intake than the C4 diet, resulting in an increased muscle delta(13)C change rate. However, for future studies, would be necessary to mix both the C3 and C4 feedstuffs to formulate diets nutritionally appropriated, with contrasting stable isotopes signatures. Tissue delta(13)C change rate is therefore indicated as a promising tool to better understand the biotic and abiotic factors that influence nutrients utilization from the diet and animal growth.
authors.affiliation: Departamento de Biologia Animal, Universidade Federal de Viçosa, Viçosa MG, Brazil. Electronic address: zuanon@ufv.br.
authors.forename: J A S
authors.initials: JAS
authors.lastname: Zuanon
authors.affiliation: Departamento de Melhoramento e Nutrição Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade Estadual Paulista, Botucatu- SP, Brazil.
authors.forename: A C
authors.initials: AC
authors.lastname: Pezzato
authors.affiliation: Centro de Isótopos Estáveis Ambientais, Unidade Auxiliar do Instituto de Biologia, Universidade Estadual Paulista, Botucatu- SP, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: Ducatti
authors.affiliation: Departamento de Melhoramento e Nutrição Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade Estadual Paulista, Botucatu- SP, Brazil.
authors.forename: M M
authors.initials: MM
authors.lastname: Barros
authors.affiliation: Departamento de Melhoramento e Nutrição Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade Estadual Paulista, Botucatu- SP, Brazil.
authors.forename: L E
authors.initials: LE
authors.lastname: Pezzato
authors.affiliation: Departamento de Bioestatística do Instituto de Biologia, Universidade Estadual Paulista, Botucatu- SP, Brazil.
authors.forename: J R S
authors.initials: JRS
authors.lastname: Passos
mesh_terms: D000821:Animal Feed; D000818:Animals; D001835:Body Weight; D002247:Carbon Isotopes; D023681:Cichlids / Q000378:metabolism*; D004032:Diet; D002523:Edible Grain / Q000737:chemistry* / Q000378:metabolism*; D005247:Feeding Behavior; D009132:Muscles / Q000378:metabolism*
chemical_list: D002247:Carbon Isotopes