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/Apr/2002
Virgínia Beretta, José Fernando Piva Lobato, Carlos Guilherme Mielitz Netto
DOI: 10.1590/S1516-35982002000400023
A static and deterministic model, synthesizing published experimental information, was used to simulate the productivity and biological efficiency of beef cattle life-cycle production systems in Rio Grande do Sul, differing in heifers’ age at first calving (IP, months) and steer age at slaughter (IA, months): “Traditional System” (ST), IP48, IA54; “Improved System” (SM), IP36, with two slaughter ages, IA36 (SM-I) and IA24 (SM-II); “One Year System” (SU), IP24, with three slaughter ages, IA36 (SU-I), IA24 (SU-II) and IA18 (SU-III). For […]
Keywords: beef cattle; biological efficiency; productivity; simulation; systems
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