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.
Luciana Navajas Rennó, Sebastião de Campos Valadares Filho, Rilene Ferreira Diniz Valadares, Mário Fonseca Paulino, Francisco Palma Rennó, Polyana Albino Silva
01/Mar/2008
Luciana Navajas Rennó, Sebastião de Campos Valadares Filho, Rilene Ferreira Diniz Valadares, Mário Fonseca Paulino, Francisco Palma Rennó, Polyana Albino Silva
DOI: 10.1590/S1516-35982008000300021
The effect of four dietary urea levels: 0, 0.65, 1.3 and 1.95% in dry matter (DM), on the microbial protein production by means of the urinary purine derivatives was evaluated by using two collection methodologies in steers of four genetic groups: Holstein in, ½ Holstein-Guzera, ½ Holstein-Gir and Zebu. Animals were fed diets with 50:50 tifton-85 bermudagrass hay to concentrate ratio and assigned to four 4 ´ 4 latin squares (genetic groups): four animals, four experimental periods and four treatments […]
Keywords: microbial nitrogen; purine in the urine; steers; urea
01/Aug/2000
Luciana Navajas Rennó, Rilene Ferreira Diniz Valadares, Maria Ignez Leão, Sebastião de Campos Valadares Filho, José Fernando Coelho da Silva, Paulo Roberto Cecon, [...]
DOI: 10.1590/S1516-35982000000400037
The work was carried out to evaluate the microbial protein production determination by means of the urinary excretion of purine derivatives; to compare the microbial protein production by means of purine base methods and of the urinary excretion of purine derivatives; to determine the microbial protein production on the dry matter intake and percentage of neutral detergent fiber in the diet; and to establish the allantoin: uric acid ratio, in relation to the xanthine and hypoxanthine in the urine. Five […]
Keywords: microbial nitrogen; purine in the urine; steers