Response of pullets to digestible lysine intake

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dc.contributor.authorAraujo, J. A. de [UNESP]
dc.contributor.authorSakomura, N. K. [UNESP]
dc.contributor.authorSilva, E. P. da [UNESP]
dc.contributor.authorDe Paula Dorigam, J. C. [UNESP]
dc.contributor.authorZanardo Donato, D. C. [UNESP]
dc.contributor.authorSilva, J. H. V. da
dc.contributor.authorFernandes, J. B. K.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionCtr Human Social & Agrarian Sci
dc.date.accessioned2015-03-18T15:56:48Z
dc.date.available2015-03-18T15:56:48Z
dc.date.issued2014-01-01
dc.description.abstractThe objective was to determine the efficiency of utilization of lysine and to describe the responses of pullets to different digestible lysine intakes using three mathematical functions to estimate an optimal intake maximizing body weight gain and feed conversion ratio. The trials were conducted using 2-6-, 8-12-, and 14-18-week-old birds and a completely randomized experimental design with eight treatments and six replicates. The digestible lysine levels ranged 3.20-10.67 g/kg (in 2-6-week-old animals), 2.24-7.48 g/kg (in 8-12-week-old animals), and 1.73-5.78 g/kg (in 14-18-week-old animals) and were obtained using a dilution technique. The efficiency of utilization was determined by a linear regression between lysine deposition and intake for pullets aged 2-4, 8-10, and 14-16 weeks. Three mathematical functions (quadratic polynomial, broken-line, and broken-line with quadratic ascending function) were used to fit the body weight gain and feed conversion responses. The optimal digestible lysine intake was obtained from the first intercept of the quadratic curve with the broken-line plateau. Based on the body weight gain, the responses obtained from the broken-line function and the broken-line with quadratic ascending were similar to those from the quadratic polynomial function. The feed conversion ratio from the first intercept of the quadratic curve with the broken-line plateau was similar to the value obtained from the broken-line with quadratic ascending function only in 2-6-week-old animals. The digestible lysine intakes required to optimize the body weight gain and feed conversion ratio responses were 202, 338, and 300 and 146, 312, and 259 mg/day and the efficiencies were 80, 76, and 80% for 2-6-, 8-12-, and 14-18-week-old animals, respectively.en
dc.description.affiliationSao Paulo State Univ UNESP, Fac Agrarian & Vet Sci, Dept Anim Sci, BR-14883900 Jaboticabal, SP, Brazil
dc.description.affiliationCtr Human Social & Agrarian Sci, Dept Agr, Bananeiras, Paraiba, Brazil
dc.description.affiliationSao Paulo State Univ UNESP, Fac Agrarian & Vet Sci, Ctr Agr, BR-14883900 Jaboticabal, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ UNESP, Fac Agrarian & Vet Sci, Dept Anim Sci, BR-14883900 Jaboticabal, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ UNESP, Fac Agrarian & Vet Sci, Ctr Agr, BR-14883900 Jaboticabal, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent208-218
dc.identifierhttp://www.agriculturejournals.cz/publicFiles/121754.pdf
dc.identifier.citationCzech Journal Of Animal Science. Prague: Czech Academy Agricultural Sciences, v. 59, n. 5, p. 208-218, 2014.
dc.identifier.issn1212-1819
dc.identifier.lattes6152329000274858
dc.identifier.lattes4599267670150719
dc.identifier.orcid0000-0001-8053-7681
dc.identifier.urihttp://hdl.handle.net/11449/117697
dc.identifier.wosWOS:000342059000002
dc.language.isoeng
dc.publisherCzech Academy Agricultural Sciences
dc.relation.ispartofCzech Journal Of Animal Science
dc.relation.ispartofjcr0.955
dc.relation.ispartofsjr0,443
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectageen
dc.subjectamino aciden
dc.subjectfeed conversion ratioen
dc.subjectgrowthen
dc.subjectmathematical functionsen
dc.titleResponse of pullets to digestible lysine intakeen
dc.typeArtigo
dcterms.rightsHolderCzech Academy Agricultural Sciences
unesp.author.lattes6152329000274858
unesp.author.lattes4599267670150719[6]
unesp.author.orcid0000-0001-8053-7681[6]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt

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