Pizzolante, CCGarcia, Edivaldo Antonio [UNESP]Laganá, CSaldanha, ESPBDeodato, APFaitarone, ABG [UNESP]Scherer, MR [UNESP]Batista, L [UNESP]2013-09-302014-05-202013-09-302014-05-202006-09-01Revista Brasileira de Ciência Avícola. Fundação APINCO de Ciência e Tecnologia Avícolas, v. 8, n. 3, p. 173-176, 2006.1516-635Xhttp://hdl.handle.net/11449/14229An experiment was carried out at the Research and Development Unit of Brotas aiming at evaluating dietary calcium level and limestone particle size on the production performance of commercial (Hy-Line Brown) layers in the second lay cycle. Experiment duration was 112 days. A total number of 288 hens, with 83 weeks of age in the beginning of the experiment, were used in a completely randomized experimental design in a factorial arrangement of 2x3, with two calcium levels (3.5 and 4.0%) and three limestone particle size compositions: 100% fine limestone (FL), 30% coarse limestone (CL) + 70% fine limestone (FL), and 50% (CL) + 50% (FL), with six replicates of eight birds each. Egg weight (g), egg production (%), egg mass (%), feed intake (g), feed conversion ratio (kg/dz and kg/kg), mortality (%), and egg loss (%) were evaluated. The analysis of variance did not detect significant differences (p>0.05) among treatments on any of the evaluated performance parameters. It was concluded that the tested calcium levels and limestone particle composition did not influence the performance of semi-heavy layers in second production cycle.173-176engCalciumlaying henslimestoneparticle sizeperformanceEffect of the calcium level and limestone particle size on the performance of semi-heavy layers in the second cycle of egg productionArtigo10.1590/S1516-635X2006000300006S1516-635X2006000300006Acesso abertoS1516-635X2006000300006.pdf6743591347106727