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.
The experiment was carried out to evaluate the effects of diets with different levels of crude protein (CP) and lysine (LYS) on characteristics of performance, egg internal quality, and nitrogen balance/retention. It was used 160 Hisex White laying hens at 48 weeks of age, individually accomodated in a complete random design in a 4 × 2 factorial scheme with four levels of crude protein (12, 14, 16 and 18%) and two levels of lysine (0.85 and 1.00%), totalizing eight treatments with five replicates of four birds each. Crude protein intake, egg weight, egg mass and percentage of the albumen show increasing linear response to the levels of crude protein in the diet. Nitrogen balance is not altered by the levels of proteins in the diets.
Performance, egg quality and nitrogen balance of commercial laying hens fed diets with different levels of crude protein and lysine
Silva,Mayra Fernanda Rizzo and Faria,Douglas Emygdio de and Rizzoli,Paula Wick and Santos,Andréa Luciana dos and Sakamoto,Márcia Izumi and Souza,Henrique Rosa Baltazar de. Performance, egg quality and nitrogen balance of commercial laying hens fed diets with different levels of crude protein and lysine. R. Bras. Zootec. [online]. 2010, vol.39, 6, [cited 2026-04-23], pp.1280-1285. Available from: <https://rbz.org.br/article/performance-egg-quality-and-nitrogen-balance-of-commercial-laying-hens-fed-diets-with-different-levels-of-crude-protein-and-lysine/>. ISSN 1516-3598. https://doi.org/10.1590/S1516-35982010000600017.
Silva,Mayra Fernanda Rizzo; Faria,Douglas Emygdio de; Rizzoli,Paula Wick; Santos,Andréa Luciana dos; Sakamoto,Márcia Izumi; Souza,Henrique Rosa Baltazar de. Performance, egg quality and nitrogen balance of commercial laying hens fed diets with different levels of crude protein and lysine. R. Bras. Zootec., v.39, 6, p. 1280-1285. Jun. 2010. Available from: <https://rbz.org.br/article/performance-egg-quality-and-nitrogen-balance-of-commercial-laying-hens-fed-diets-with-different-levels-of-crude-protein-and-lysine/>. acess on 23 Apr. 2026. https://doi.org/10.1590/S1516-35982010000600017.
Silva,Mayra Fernanda Rizzo, & Faria,Douglas Emygdio de, & Rizzoli,Paula Wick, & Santos,Andréa Luciana dos, & Sakamoto,Márcia Izumi, & Souza,Henrique Rosa Baltazar de. (2010). Performance, egg quality and nitrogen balance of commercial laying hens fed diets with different levels of crude protein and lysine. R. Bras. Zootec., 39(6) , 1280-1285. https://doi.org/10.1590/S1516-35982010000600017.
SilvaMayra Fernanda Rizzo, FariaDouglas Emygdio de, RizzoliPaula Wick, SantosAndréa Luciana dos, SakamotoMárcia Izumi, SouzaHenrique Rosa Baltazar de. Performance, egg quality and nitrogen balance of commercial laying hens fed diets with different levels of crude protein and lysine. R. Bras. Zootec. [Internet]. 2010 Jun [cited 2026 Apr 23]; 39(6): 1280-1285. Available from: https://rbz.org.br/article/performance-egg-quality-and-nitrogen-balance-of-commercial-laying-hens-fed-diets-with-different-levels-of-crude-protein-and-lysine/. https://doi.org/10.1590/S1516-35982010000600017.
Figure 6
Differential abundance for the species Faecalibacterium prausnitzii (A) and Megamonas funiformis (B).
