Limestone and oyster shell for brown layers in their second egg production cycle

Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T18:40:19Z No. of bitstreams: 1 S1516-635X2011000200004.pdf: 803840 bytes, checksum: c7dd3536b912c6e3e62e2234fa668010 (MD5) Made available in DSpace on 2013-08-22T18:40:19Z (GMT). No. of bitstreams: 1 S1516-635X2011000200004.pdf: 803840 bytes, checksum: c7dd3536b912c6e3e62e2234fa668010 (MD5) Previous issue date: 2011-06-01 Made available in DSpace on 2013-09-30T18:00:24Z (GMT). No. of bitstreams: 2 S1516-635X2011000200004.pdf: 803840 bytes, checksum: c7dd3536b912c6e3e62e2234fa668010 (MD5) S1516-635X2011000200004.pdf.txt: 39994 bytes, checksum: acd8d2b277d7080c571e190ddd18d9b9 (MD5) Previous issue date: 2011-06-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T13:17:44Z No. of bitstreams: 2 S1516-635X2011000200004.pdf: 803840 bytes, checksum: c7dd3536b912c6e3e62e2234fa668010 (MD5) S1516-635X2011000200004.pdf.txt: 39994 bytes, checksum: acd8d2b277d7080c571e190ddd18d9b9 (MD5) Made available in DSpace on 2014-05-20T13:17:44Z (GMT). No. of bitstreams: 2 S1516-635X2011000200004.pdf: 803840 bytes, checksum: c7dd3536b912c6e3e62e2234fa668010 (MD5) S1516-635X2011000200004.pdf.txt: 39994 bytes, checksum: acd8d2b277d7080c571e190ddd18d9b9 (MD5) Previous issue date: 2011-06-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) This study aimed at evaluating the effect of dietary calcium levels and the replacement of calcium sources with different particle size compositions on the performance and egg quality of brown layers in their second egg production cycle. A randomized block experimental design was applied with 12 treatments in a 3x4 factorial arrangement: three calcium levels (2.6, 3.2, 3.8 %) and four combinations of calcium sources (1- 100% fine limestone (FL), 2- 50% FL + 50% coarse limestone (CL), 3- 50% FL and 50% oyster shell (OS), 4- 50% FL and 25% CL+ 25 %OS), with six replicates of eight birds each. Calcium sources were analyzed for geometric mean diameter (GMD) and in-vitro solubility. The following performance and egg quality parameters were evaluated: egg weight (EW, g), egg production (% Eggs), egg mass (EM %), feed intake (FI g), feed conversion ratio (FCR kg/dz and FCR kg/kg), mortality (% Mort.), specific egg gravity (SG), percentages of yolk (Y%), albumen (Alb%) and eggshell (ES%), eggshell thickness (EST), eggshell breaking strength (BS), eggshell weight per surface area (EWSA), Haugh unit (HU), yolk index (YI) and yolk color. Performance and internal egg quality were not affected by the treatments (p>0.05). Blocks had a significant effect on (p