Modelling of sulphur amino acid requirements and nitrogen endogenous losses in kittens

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dc.contributor.authorSato, Joyce
dc.contributor.authorMerenda, Mônica Estela Zambon
dc.contributor.authorUemoto, Aline Terumi
dc.contributor.authorDos Santos, Mateus Pereira
dc.contributor.authorBarion, Mariana Regina Lingiardi
dc.contributor.authorCarciofi, Aulus Cavalieri [UNESP]
dc.contributor.authorde Paula Dorigam, Juliano César [UNESP]
dc.contributor.authorRibeiro, Leonir Bueno
dc.contributor.authorVasconcellos, Ricardo Souza
dc.contributor.institutionState University of Maringá
dc.contributor.institutionVeterinary Physician
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2020-12-12T02:48:20Z
dc.date.available2020-12-12T02:48:20Z
dc.date.issued2020-01-01
dc.description.abstractThe objective of this study was to estimate the sulphur amino acid (methionine + cystine) requirements and nitrogen endogenous losses in kittens aged 150 to 240 d. Thirty-six cats were distributed in six treatments (six cats per treatment) consisting of different concentrations of methionine + cystine (M + C): T1, 6.5 g/kg; T2, 8.8 g/kg; T3, 11.3 g/kg; T4, 13.6 g/kg; T5, 16.0 g/kg; and control, 6.5 g/kg. Diets were formulated by serial dilution of T5 (a diet relatively deficient in M + C but containing high protein concentrations) with a minimal nitrogen diet (MND). Thus, crude protein and amino acid concentrations in diets T1–T5 decreased by the same factor. The control diet was the T1 diet supplemented with adequate concentrations of M + C (6.5 g/kg; 8.8 g/kg; 11.3 g/kg; 13.6 g/kg and 16.0 g/kg). All diets were based on ingredients commonly used in extruded cat diets. Digestibility assays were performed for the determination of nitrogen balance. Nitrogen intake (NI) and nitrogen excretion (NEX) results data were fitted with an exponential equation to estimate nitrogen maintenance requirement (NMR), theoretical maximum for daily nitrogen retention (NRmaxT), and protein quality (b). M + C requirements were calculated from the limiting amino acid intake (LAAI) equation assuming a nitrogen retention of 45 to 65% NRmaxT. The NMR of kittens aged 150, 195, and 240 d was estimated at 595, 559, and 455 mg/kg body weight (BW)0.67 per day, respectively, and M + C requirements were estimated at 517, 664, and 301 mg/kg BW0.67 per day, respectively.en
dc.description.affiliationDepartment of Animal Science State University of Maringá
dc.description.affiliationVeterinary Physician
dc.description.affiliationDepartment of Clinical and Veterinary Surgery School of Agricultural and Veterinarian Science São Paulo State University (UNESP
dc.description.affiliationUnespDepartment of Clinical and Veterinary Surgery School of Agricultural and Veterinarian Science São Paulo State University (UNESP
dc.identifierhttp://dx.doi.org/10.1080/1745039X.2020.1797433
dc.identifier.citationArchives of Animal Nutrition.
dc.identifier.doi10.1080/1745039X.2020.1797433
dc.identifier.issn1477-2817
dc.identifier.issn1745-039X
dc.identifier.scopus2-s2.0-85089779714
dc.identifier.urihttp://hdl.handle.net/11449/202041
dc.language.isoeng
dc.relation.ispartofArchives of Animal Nutrition
dc.sourceScopus
dc.subjectcats
dc.subjectcystine
dc.subjectGöttingen method
dc.subjectkittens
dc.subjectmethionine
dc.subjectnitrogen balance
dc.subjectrequirements
dc.titleModelling of sulphur amino acid requirements and nitrogen endogenous losses in kittensen
dc.typeArtigo
unesp.author.lattes4620650316029248[6]
unesp.author.orcid0000-0002-4448-1163[1]
unesp.author.orcid0000-0002-6070-6262[2]
unesp.author.orcid0000-0003-3859-3983[6]
unesp.author.orcid0000-0001-5452-9805[8]

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