2013
DOI: 10.1590/s1516-35982013000700004
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Abstract: -The experiment was conducted to evaluate the effects of limestone particle size and the use of artificial light for laying hens in the second laying cycle. We used 240 Hisex White laying hens at 82 weeks of age in a completely randomized design in a 5 × 2 factorial arrangement, resulting in 10 treatments with 4 replicates of 6 birds. The variables were the five particle sizes obtained by increasing the proportion of thick limestone (0, 25, 50, 75 and 100%) compared with thin limestone and two lighting program… Show more

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Cited by 11 publications
(6 citation statements)
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“…As to the use of artificial light for layers, similar effects to those obtained herein were reported by Gewehr & Freitas (2007), and Oliveira et al (2013). They observed that the use of natural lighting (+/-12 hours) provided similar performance to the program using artificial light to supply 16 hours of light to the layers.…”
Section: Resultssupporting
confidence: 87%
See 1 more Smart Citation
“…As to the use of artificial light for layers, similar effects to those obtained herein were reported by Gewehr & Freitas (2007), and Oliveira et al (2013). They observed that the use of natural lighting (+/-12 hours) provided similar performance to the program using artificial light to supply 16 hours of light to the layers.…”
Section: Resultssupporting
confidence: 87%
“…Thus, ensuring food intake at night may increase the availability of calcium for eggshell formation. The change in the particle size of calcium sources have been studied with some positive results for the quality of eggshell (Lichovnikova, 2007;Skřivan et al, 2010) and bird bones (Saunders-Blades et al, 2009;Witt et al, 2009;Araújo et al, 2011;Cufadar et al, 2011;Oliveira et al, 2013;Tunç & Cufadar, 2015), when larger particles of calcium sources are offered in the rations.…”
Section: Introductionmentioning
confidence: 99%
“…Working with increasing levels of coarse limestone for white-egg layers, Oliveira et al (2013) observed that the limestone particle size did not influence the Seedor index or the mineral matter; the present study corroborates these findings.…”
Section: Chelated Minerals and Limestone Particle Sizes On Performancsupporting
confidence: 87%
“…The bone quality variables of the tibia were not influenced by the treatments, except for bone deformity, which showed higher averages in treatments which contained fungal phytase (Table 5). Deformity measures the flexibility of the bone as a function of a force applied to it until the moment of its rupture (Oliveira et al, 2013), and is directly related to the breaking resistance of the bone. As noted, fungal phytase provided an improvement in tibial bone deformity, regardless of the dosage used.…”
Section: Resultsmentioning
confidence: 99%