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/Feb/2007
Mário Luiz Chizzotti, Sebastião de Campos Valadares Filho, Rilene Ferreira Diniz Valadares, Fernanda Helena Martins Chizzotti, Marcos Inácio Marcondes, Mozart Alves Fonseca
DOI: 10.1590/S1516-35982007000100017
The objective of this trial was to evaluate the effect of milk production level on intake, digestibility of nutrients, microbial protein synthesis, and nitrogen (N) metabolism in Holstein cows. It was also of particular interest to compare spot urine sampling and total urine collection as methodologies to quantify yield of microbial N using purine derivatives (PD) as indirect microbial markers. Fifteen Holstein cows were grouped by milk yield (5.88 kg/day: LOW treatment; 18.54 kg/day: MEDIUM treatment; and 32.6 kg/day: HIGH […]
Keywords: microbial protein; milk urea nitrogen; NDFap; serum urea nitrogen; spot sampling
Mario Luiz Chizzotti, Sebastião de Campos Valadares Filho, Rilene Ferreira Diniz Valadares, Fernanda Helena Martins Chizzotti, José Maurício de Souza Campos, Marcos Inácio Marcondes, [...]
01/Aug/2006
Mario Luiz Chizzotti, Sebastião de Campos Valadares Filho, Rilene Ferreira Diniz Valadares, Fernanda Helena Martins Chizzotti, José Maurício de Souza Campos, Marcos Inácio Marcondes, [...]
DOI: 10.1590/S1516-35982006000600032
The objective of this trial was to evaluate the effect of body weight (BW) of heifers on intake, apparent digestibility of nutrients, microbial protein synthesis, ruminal metabolism, and urinary excretion of nitrogenous compounds. The spot urine sampling and the total collection of urine techniques were used to estimate microbial N flow. Twenty-two heifers with different body weights (523, 453, 315, 235 and 118 kg) were used in a completely randomized design and assigned to the following treatments: BW523, BW453, BW315, […]
Keywords: Holstein; microbial protein; NDFap; serum urea nitrogen; spot sample