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.
This experiment was carried with Japanese quails in the egg production phase with the objective of determining the requirements of digestible methionine + cystine (M+C) for higher production and egg quality. A total of 240 Japanese quails were distributed in a randomized complete block design. The basal diet was supplemented with different DL-methionine levels, corresponding to digestible methionine + cystine levels of 0.55, 0.61, 0.67, 0.73 and 0.79%. The characteristics analyzed were feed intake (g/quail/day), egg production (%), egg weight (g), egg mass (g/quail/day), feed conversion (dozen eggs/egg mass and kg feed/dozen eggs), egg shell (% and g), albumen (% and g), yolk (% and g) and specific gravity (g/cm3). The digestible M+C level for Japanese quails was 0.696% in the diet, corresponding to a daily intake of 186.7 mg/quail.
Nutritional requirements of digestible methionine + cystine for Japanese quails in production phase
Costa,Fernando Guilherme Perazzo and Rodrigues,Valéria Pereira and Goulart,Cláudia de Castro and Junior,José Geraldo Vargas and Silva,José Humberto Vilar da and Souza,Janete Gouveia de. Nutritional requirements of digestible methionine + cystine for Japanese quails in production phase. R. Bras. Zootec. [online]. 2009, vol.38, 12, [cited 2026-03-15], pp.2389-2393. Available from: <https://rbz.org.br/article/nutritional-requirements-of-digestible-methionine-cystine-for-japanese-quails-in-production-phase/>. ISSN 1516-3598. https://doi.org/10.1590/S1516-35982009001200014.
Costa,Fernando Guilherme Perazzo; Rodrigues,Valéria Pereira; Goulart,Cláudia de Castro; Junior,José Geraldo Vargas; Silva,José Humberto Vilar da; Souza,Janete Gouveia de. Nutritional requirements of digestible methionine + cystine for Japanese quails in production phase. R. Bras. Zootec., v.38, 12, p. 2389-2393. Dec. 2009. Available from: <https://rbz.org.br/article/nutritional-requirements-of-digestible-methionine-cystine-for-japanese-quails-in-production-phase/>. acess on 15 Mar. 2026. https://doi.org/10.1590/S1516-35982009001200014.
Costa,Fernando Guilherme Perazzo, & Rodrigues,Valéria Pereira, & Goulart,Cláudia de Castro, & Junior,José Geraldo Vargas, & Silva,José Humberto Vilar da, & Souza,Janete Gouveia de. (2009). Nutritional requirements of digestible methionine + cystine for Japanese quails in production phase. R. Bras. Zootec., 38(12) , 2389-2393. https://doi.org/10.1590/S1516-35982009001200014.
CostaFernando Guilherme Perazzo, RodriguesValéria Pereira, GoulartCláudia de Castro, JuniorJosé Geraldo Vargas, SilvaJosé Humberto Vilar da, SouzaJanete Gouveia de. Nutritional requirements of digestible methionine + cystine for Japanese quails in production phase. R. Bras. Zootec. [Internet]. 2009 Dec [cited 2026 Mar 15]; 38(12): 2389-2393. Available from: https://rbz.org.br/article/nutritional-requirements-of-digestible-methionine-cystine-for-japanese-quails-in-production-phase/. https://doi.org/10.1590/S1516-35982009001200014.
Figure 3
Ruminal disappearance of ash-free neutral detergent fiber (aNDFom) at 30 h of in situ incubation in corn husks (fresh and ensiled) treated with calcium oxide (CaO) and a mixture of corn heavy steep water and sugarcane molasses (HM).
