Prediction of the metabolizable energy requirements of free-range laying hens

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dc.contributor.authorBrainer, M. M. A.
dc.contributor.authorRabello, C. B. V.
dc.contributor.authorSantos, M. J. B. [UNESP]
dc.contributor.authorLopes, C. C.
dc.contributor.authorLudke, J. V.
dc.contributor.authorSilva, J. H. V.
dc.contributor.authorLima, R. A.
dc.contributor.institutionGoiano Fed Inst
dc.contributor.institutionUniv Fed Rural Pernambuco
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
dc.contributor.institutionUniv Fed Paraiba
dc.date.accessioned2018-11-26T15:28:43Z
dc.date.available2018-11-26T15:28:43Z
dc.date.issued2016-01-01
dc.description.abstractThis experiment was conducted with the aim of estimating the ME requirements of free-range laying hens for maintenance, weight gain, and egg production. These experiments were performed to develop an energy requirement prediction equation by using the comparative slaughter technique and the total excreta collection method. Regression equations were used to relate the energy intake, the energy retained in the body and eggs, and the heat production of the hens. These relationships were used to determine the daily ME requirement for maintenance, the efficiency energy utilization above the requirements for maintenance, and the NE requirement for maintenance. The requirement for weight gain was estimated from the energy content of the carcass, and the diet's efficiency energy utilization was determined from the weight gain, which was measured during weekly slaughter. The requirement for egg production was estimated by considering the energy content of the eggs and the efficiency of energy deposition in the eggs. The requirement and efficiency energy utilization for maintenance were 121.8 kcal ME/(kg(0.75).d) and 0.68, respectively. Similarly, the NE requirement for maintenance was 82.4 kcal ME/(kg(0.75).d), and the efficiency energy utilization above maintenance was 0.61. Because the carcass body weight and energy did not increase during the trial, the weight gain could not be estimated. The requirements for egg production requirement and efficiency energy utilization for egg production were 2.48 kcal/g and 0.61, respectively. The following energy prediction equation for free-range laying hens (without weight gain) was developed: ME k(cal)/(hen . d) = 121.8 x W-0.75 + 2.48 x EM, in which W = body weight (kg) and EM = egg mass (g/[hen . d]).en
dc.description.affiliationGoiano Fed Inst, BR-76300000 Ceres, Go, Brazil
dc.description.affiliationUniv Fed Rural Pernambuco, Dept Anim Sci, BR-52171900 Recife, PE, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Anim Sci, BR-14884900 Jaboticabal, SP, Brazil
dc.description.affiliationBrazilian Agr Res Corp Embrapa, BR-70770901 Concordia, SC, Brazil
dc.description.affiliationUniv Fed Paraiba, Ctr Agr Sci, BR-58051900 Areia, BP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Anim Sci, BR-14884900 Jaboticabal, SP, Brazil
dc.description.sponsorshipFundacao de Amparo a Pesquisa do Estado de Pernambuco (FACEPE)
dc.description.sponsorshipGoiano Federal Institute
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.format.extent117-124
dc.identifierhttp://dx.doi.org/10.2527/jas2015-9272
dc.identifier.citationJournal Of Animal Science. Champaign: Amer Soc Animal Science, v. 94, n. 1, p. 117-124, 2016.
dc.identifier.doi10.2527/jas2015-9272
dc.identifier.issn0021-8812
dc.identifier.urihttp://hdl.handle.net/11449/158708
dc.identifier.wosWOS:000370375600013
dc.language.isoeng
dc.publisherAmer Soc Animal Science
dc.relation.ispartofJournal Of Animal Science
dc.relation.ispartofsjr0,848
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectcomparative slaughter
dc.subjectegg production
dc.subjectfactorial method
dc.titlePrediction of the metabolizable energy requirements of free-range laying hensen
dc.typeArtigo
dcterms.rightsHolderAmer Soc Animal Science

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