Produtividade e eficiência biológica de sistemas pecuários de cria diferindo na idade das novilhas ao primeiro parto e na taxa de natalidade do rebanho no Rio Grande de Sul

By Virginia Beretta, J. Lobato, C. A. G. M. Netto. 2001

58 citations recorded by the source corpus.

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 and OYS showed a quadratic response curve, with maximum production of 83,9 and 77,9 kg of weaned calf (WC)/ ha for CR of 82,5 and 92,3%, respectively. TS response was linear, with increments of 6,1 kg WC/ha for each 10% increase in CR. Energetic cost per quilogram of WC was reduced linearly with increments in CR.

Subfields: Forestry, Management, Monitoring, Policy and Law, Soil Science

View Paper: https://www.semanticscholar.org/paper/351a0f4de05becce4db8923ea12051c02c8ad093