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 objective of this trial was to study the effects of different forms of concentrate processing on ruminal pH and ammonia as well as on plasma concentration of urea. Sixteen dairy cows, pure Holstein and crossbred, were blocked by production level (30.0 and 20.0 kg/day) and randomly assigned to two Latin squares with four periods of 15 days each. Diets were isonitrogenous and contained the following forage (corn silage):concentrate ratios: 50:50 and 60:40 (% of DM) for cows yielding 30.0 and 20.0 kg of milk/day, respectively. Ruminal pH and ammonia (N-NH3) did not differ at 0 h (pre-feeding) and at 3 h after the morning feeding in the different production levels. However, it was observed lower ruminal ammonia concentration at 3 h post-feeding on cows fed diets contained extruded concentrate. Plasma urea did not differ across diets while for urinary excretion of nitrogen a significant difference was observed only for the diet containing the partially processed high-energy concentrate.
Ruminal metabolism, plasma urea concentration, and urinary excretion of nitrogen of dairy cows fed concentrate processed in different forms
Filho,Humberto Luiz Wernersbach and Campos,José Maurício de Souza and Assis,Anderson Jorge de and Filho,Sebastião de Campos Valadares and Queiroz,Augusto César de and Valadares,Rilene Ferreira Diniz and Lana,Rogério de Paula. Ruminal metabolism, plasma urea concentration, and urinary excretion of nitrogen of dairy cows fed concentrate processed in different forms. R. Bras. Zootec. [online]. 2006, vol.35, 3 suppl., [cited 2026-04-24], pp.1239-1241. Available from: <https://rbz.org.br/article/ruminal-metabolism-plasma-urea-concentration-and-urinary-excretion-of-nitrogen-of-dairy-cows-fed-concentrate-processed-in-different-forms/>. ISSN 1516-3598. https://doi.org/10.1590/S1516-35982006000400039.
Filho,Humberto Luiz Wernersbach; Campos,José Maurício de Souza; Assis,Anderson Jorge de; Filho,Sebastião de Campos Valadares; Queiroz,Augusto César de; Valadares,Rilene Ferreira Diniz; Lana,Rogério de Paula. Ruminal metabolism, plasma urea concentration, and urinary excretion of nitrogen of dairy cows fed concentrate processed in different forms. R. Bras. Zootec., v.35, 3 suppl., p. 1239-1241. Jun. 2006. Available from: <https://rbz.org.br/article/ruminal-metabolism-plasma-urea-concentration-and-urinary-excretion-of-nitrogen-of-dairy-cows-fed-concentrate-processed-in-different-forms/>. acess on 24 Apr. 2026. https://doi.org/10.1590/S1516-35982006000400039.
Filho,Humberto Luiz Wernersbach, & Campos,José Maurício de Souza, & Assis,Anderson Jorge de, & Filho,Sebastião de Campos Valadares, & Queiroz,Augusto César de, & Valadares,Rilene Ferreira Diniz, & Lana,Rogério de Paula. (2006). Ruminal metabolism, plasma urea concentration, and urinary excretion of nitrogen of dairy cows fed concentrate processed in different forms. R. Bras. Zootec., 35(3 suppl.) , 1239-1241. https://doi.org/10.1590/S1516-35982006000400039.
FilhoHumberto Luiz Wernersbach, CamposJosé Maurício de Souza, AssisAnderson Jorge de, FilhoSebastião de Campos Valadares, QueirozAugusto César de, ValadaresRilene Ferreira Diniz, LanaRogério de Paula. Ruminal metabolism, plasma urea concentration, and urinary excretion of nitrogen of dairy cows fed concentrate processed in different forms. R. Bras. Zootec. [Internet]. 2006 Jun [cited 2026 Apr 24]; 35(3 suppl.): 1239-1241. Available from: https://rbz.org.br/article/ruminal-metabolism-plasma-urea-concentration-and-urinary-excretion-of-nitrogen-of-dairy-cows-fed-concentrate-processed-in-different-forms/. https://doi.org/10.1590/S1516-35982006000400039.
Figure 6
Mean values of the leaf/stem ratio of elephant grass genotypes during the dry season.
