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/Oct/2003
Urbano Gomes Pinto de Abreu, Ivo Martins Cezar, Robledo de Almeida Torres
DOI: 10.1590/S1516-35982003000500021
Four effects related to the establishment of breeding season in production systems were analysed using a bioeconomic simulation model arise from implantation of breeding season in production systems. The effects were: decrease calf’s mortality rate (10 to 4%) (effect A); reduction of bulls:cows relation from 1:25 to 1:33 (effect B); increase reproduction of cows (65 to 75%) (effect C); and reduction of herdsman number (effect D). With these effects were five scenery. The rate increase of present net value and […]
Keywords: beef herd; bioeconomic simulation; breeding season
01/Jul/2001
Virgínia Beretta, José Fernando Piva Lobato, Carlos Guilherme A. Mielitz Netto
DOI: 10.1590/S1516-35982001000500022
A simulation model was used to evaluate productivity and efficiency of beef cow-calf systems in Rio Grande do Sul State with different heifers first calving age (CA, years) and calving rates (CR): “Traditional System” (TS) CA=4; “Improved System (IS)” CA=3; “One Year System (OYS)” CA=2. In each system it was studied the effect of CR varying from 50 to 90%. A statistic deterministic model was used. The effect of reducing CA on productivity and efficiency was dependent of CR. IS […]
Keywords: beef herd; biological efficiency; productivity; simulation; systems