The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
Two hundred and sixteen layers were raised from 39 to 55 weeks of age to study the effects of levels of calcium in the rations on performance and eggs quality of brown commercial layers. A completely randomized experimental design were used with six levels of calcium (3.0; 3.4; 3.8; 4.2; 4.6 and 5.0%) and six replicates of six layers hens. There was no effect of calcium levels on hen performance, however significantly affected the percentage of albumen and egg shell. The increase of calcium in the diet promoted increment in egg shell quality in relationship to other eggs components. The calcium level of 4.3% is recommended for brown layer hens after production peak.
Levels of calcium in diets for brown layers post-peak production
Costa,Fernando Guilherme Perazzo and Oliveira,Cleber Franklin Santos de and Dourado,Leilane Rocha Barros and Neto,Raul da Cunha Lima and Campos,Miguel Ângelo da Silva Fernandes and Lima,Anny Graycy Vasconcelos de Oliveira. Levels of calcium in diets for brown layers post-peak production. R. Bras. Zootec. [online]. 2008, vol.37, 4, [cited 2026-04-23], pp.624-628. Available from: <https://rbz.org.br/article/levels-of-calcium-in-diets-for-brown-layers-post-peak-production/>. ISSN 1516-3598. http://doi.org/10.1590/S1516-35982008000400006.
Costa,Fernando Guilherme Perazzo; Oliveira,Cleber Franklin Santos de; Dourado,Leilane Rocha Barros; Neto,Raul da Cunha Lima; Campos,Miguel Ângelo da Silva Fernandes; Lima,Anny Graycy Vasconcelos de Oliveira. Levels of calcium in diets for brown layers post-peak production. R. Bras. Zootec., v.37, 4, p. 624-628. Apr. 2008. Available from: <https://rbz.org.br/article/levels-of-calcium-in-diets-for-brown-layers-post-peak-production/>. acess on 23 Apr. 2026. http://doi.org/10.1590/S1516-35982008000400006.
Costa,Fernando Guilherme Perazzo, & Oliveira,Cleber Franklin Santos de, & Dourado,Leilane Rocha Barros, & Neto,Raul da Cunha Lima, & Campos,Miguel Ângelo da Silva Fernandes, & Lima,Anny Graycy Vasconcelos de Oliveira. (2008). Levels of calcium in diets for brown layers post-peak production. R. Bras. Zootec., 37(4) , 624-628. http://doi.org/10.1590/S1516-35982008000400006.
CostaFernando Guilherme Perazzo, OliveiraCleber Franklin Santos de, DouradoLeilane Rocha Barros, NetoRaul da Cunha Lima, CamposMiguel Ângelo da Silva Fernandes, LimaAnny Graycy Vasconcelos de Oliveira. Levels of calcium in diets for brown layers post-peak production. R. Bras. Zootec. [Internet]. 2008 Apr [cited 2026 Apr 23]; 37(4): 624-628. Available from: https://rbz.org.br/article/levels-of-calcium-in-diets-for-brown-layers-post-peak-production/. http://doi.org/10.1590/S1516-35982008000400006.
Figure 6
Differential abundance for the species Faecalibacterium prausnitzii (A) and Megamonas funiformis (B).
