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.
01/Dec/2001
Rosângela Maria Nunes da Silva, Rilene Ferreira Diniz Valadares, Sebastião de Campos Valadares Filho, Paulo Roberto Cecon, Luciana Navajas Rennó, Juliana Munique da Silva
DOI: 10.1590/S1516-35982001000700035
This research was carried out, using 15 dairy cows (Holstein x Gyr) full fed isoproteic diets with 60% silage and 40% concentrate in the dry matter (DM) basis and 0, 0.7, 1.4, and 2.1% urea correspondent to 2.08, 4.01, 5.76, and 8.07% of crude protein levels in the form of non protein nitrogen compounds (NNP), with the objectives to a non invasive methodology, to estimate the microbial protein production, using the total excretion of purine derivatives (PD); to evaluate the […]
Keywords: creatinine; milk; nitrogen retention; purine derivatives; urine
01/Feb/2001
Edson Luis de Azambuja Ribeiro, João Restle, Marco Antônio da Rocha, Ivone Yurika Mizubuti, Leandro das Dôres Ferreira da Silva
DOI: 10.1590/S1516-35982001000100019
The objective of this work was to evaluate the productive efficiency of beef cows. Thirty Angus and 32 Charolais primiparous cows, pregnant at the beginning of the experiment with straightbred or crossbred calves, were evaluated. The cows were submitted to different feeding management during winter and spring: T1 ¾ Native pasture, T2 ¾ Cultivated pasture for 60 days (24 hours/day), from early September to early November, T3 ¾ Cultivated pasture for two hours a day, for 60 days, from early […]
Keywords: beef cattle; crossbreeding; milk; productivity; weight