dc.contributorUniversidade José do Rosário Vellano
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2013-09-30T19:25:35Z
dc.date.accessioned2014-05-20T13:41:00Z
dc.date.available2013-09-30T19:25:35Z
dc.date.available2014-05-20T13:41:00Z
dc.date.created2013-09-30T19:25:35Z
dc.date.created2014-05-20T13:41:00Z
dc.date.issued2009-06-01
dc.identifierRevista Brasileira de Ciência Avícola. Fundação APINCO de Ciência e Tecnologia Avícolas, v. 11, n. 2, p. 87-94, 2009.
dc.identifier1516-635X
dc.identifierhttp://hdl.handle.net/11449/14226
dc.identifier10.1590/S1516-635X2009000200003
dc.identifierS1516-635X2009000200003
dc.identifierWOS:000269654400003
dc.identifierS1516-635X2009000200003.pdf
dc.identifier6743591347106727
dc.identifier7728883010098049
dc.description.abstractThis study evaluated the effect of dietary calcium levels and limestone particle size distribution on first-cycle layer performance and egg quality. A completely randomized experimental design in 4x3 factorial arrangement (four Ca levels - 3.0, 3.5, 4.0, 4.5%; and three limestone particle size distributions - 100% fine, 50% fine and 50% coarse, 30% fine and 70% coarse) was applied, totaling 12 treatments with six replicates of eight birds each. The treatments did not influence the most of evaluated performance and internal and external egg quality parameters. However, limestone particle size distribution quadratically affected with percentage of defective eggs, with the lowest percentage obtained with the distribution 61.75% fine limestone and 38.25% coarse limestone. Increasing dietary Ca levels significantly increased eggshell weight per surface area and the percentage of Ca excreted in the feces. It was concluded that the combination of the highest dietary Ca level (4.5%) with 50% replacement of fine-particle limestone by coarse limestone results in better eggshell and increases the number of marketable eggs.
dc.languageeng
dc.publisherFundação APINCO de Ciência e Tecnologia Avícolas
dc.relationRevista Brasileira de Ciência Avícola
dc.relation0.463
dc.rightsAcesso aberto
dc.sourceSciELO
dc.subjectEgg production
dc.subjectlimestone
dc.subjectmarketable eggs
dc.subjectnutrition
dc.subjectpoultry
dc.titleCalcium levels and limestone particle size in the diet of commercial layers at the end of the first production cycle
dc.typeArtículos de revistas


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