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.
Four experiments were accomplished using 720 white-egg pullets and 720 brown-egg pullets from 0 to 6 age weeks, were allotted to a completely randomized design with five calcium levels (.70, .80, .90, 1.00, and 1.10%) or five levels of available phosphorus (.30, .35, .40, .45, and .50%), with four replicates and 18 pullets for experimental unit. The experimental diets were formulated with soybean meal and corn to contain 2900 kcal of metabolizable energy/kg of diet, 18% crude protein, .70% calcium for calcium experiments and .30% of available phosphorus for phosphorus experiments. Diets and water were ad libitum fed during the experimental period. The evaluated characteristics were weight gain, feed intake, feed: gain ratio, bone resistance, bone ash and bone calcium (calcium experiments) or bone phosphorus (experiments of available phosphorus). Requirements of .937% and .961% of calcium and .420% and .423% of available phosphorus for white-egg pullets and brown-egg pullets, respectively, were estimated.
Nutritional levels of calcium and available phosphorus for white-egg pullets and brown-egg pullets from 0 to 6 weeks of age
Junior,José Geraldo de Vargas and Albino,Luiz Fernando Teixeira and Rostagno,Horacio Santiago and Gomes,Paulo Cézar and Cupertino,Edwiney Sebastião and Carvalho,Débora Cristine Oliveira and Nascimento,Adriana Helena do. Nutritional levels of calcium and available phosphorus for white-egg pullets and brown-egg pullets from 0 to 6 weeks of age. R. Bras. Zootec. [online]. 2003, vol.32, 6 suppl.2, [cited 2026-03-11], pp.1919-1926. Available from: <https://rbz.org.br/article/nutritional-levels-of-calcium-and-available-phosphorus-for-white-egg-pullets-and-brown-egg-pullets-from-0-to-6-weeks-of-age/>. ISSN 1516-3598. http://doi.org/10.1590/S1516-35982003000800016.
Junior,José Geraldo de Vargas; Albino,Luiz Fernando Teixeira; Rostagno,Horacio Santiago; Gomes,Paulo Cézar; Cupertino,Edwiney Sebastião; Carvalho,Débora Cristine Oliveira; Nascimento,Adriana Helena do. Nutritional levels of calcium and available phosphorus for white-egg pullets and brown-egg pullets from 0 to 6 weeks of age. R. Bras. Zootec., v.32, 6 suppl.2, p. 1919-1926. Dec. 2003. Available from: <https://rbz.org.br/article/nutritional-levels-of-calcium-and-available-phosphorus-for-white-egg-pullets-and-brown-egg-pullets-from-0-to-6-weeks-of-age/>. acess on 11 Mar. 2026. http://doi.org/10.1590/S1516-35982003000800016.
Junior,José Geraldo de Vargas, & Albino,Luiz Fernando Teixeira, & Rostagno,Horacio Santiago, & Gomes,Paulo Cézar, & Cupertino,Edwiney Sebastião, & Carvalho,Débora Cristine Oliveira, & Nascimento,Adriana Helena do. (2003). Nutritional levels of calcium and available phosphorus for white-egg pullets and brown-egg pullets from 0 to 6 weeks of age. R. Bras. Zootec., 32(6 suppl.2) , 1919-1926. http://doi.org/10.1590/S1516-35982003000800016.
JuniorJosé Geraldo de Vargas, AlbinoLuiz Fernando Teixeira, RostagnoHoracio Santiago, GomesPaulo Cézar, CupertinoEdwiney Sebastião, CarvalhoDébora Cristine Oliveira, NascimentoAdriana Helena do. Nutritional levels of calcium and available phosphorus for white-egg pullets and brown-egg pullets from 0 to 6 weeks of age. R. Bras. Zootec. [Internet]. 2003 Dec [cited 2026 Mar 11]; 32(6 suppl.2): 1919-1926. Available from: https://rbz.org.br/article/nutritional-levels-of-calcium-and-available-phosphorus-for-white-egg-pullets-and-brown-egg-pullets-from-0-to-6-weeks-of-age/. http://doi.org/10.1590/S1516-35982003000800016.
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).
