LiGAPS-Beef is a mechanistic model to assess potential and feed-limited beef production in different beef production systems across the world. The model is one of the first using concepts of production ecology to simulate livestock production. LiGAPS-Beef consists of a thermoregulation sub-model, a feed intake and digestion sub-model, and an energy and protein utilization sub-model. Energy and protein flows are included. Livestock production can be assessed for individual animals and herds. LiGAPS-Beef simulates cattle growth based on defining growth factors (genotype or breed and climate) and limiting growth factors (feed quality and feed quantity). The model can be used to assess yield gaps in beef production systems, and to explore improvement options for yield gap mitigation.
Feed intake, average daily weight gain, beef production, feed conversion efficiency, and constraining factors for growth (genotype, heat stress, cold stress, digestion capacity, energy deficiency, protein deficiency)
R 2.15.3, or a more recent version of this programming language, is required to run the model. In addition, RStudio 0.98, or a more recent version of this programming language, is recommended to run the model.
Examples: LiGAPS-Beef has been combined with the model LINGRA (Light INterception and utilization- GRAss, available on the PPS model portal as well) to simulate beef production in grazing systems under climate change. Beef production systems with Charolais cattle in the Charolais Basin of France were selected. The combination of LiGAPS-Beef and LINGRA allowed to determine optimum stocking densities and to maximize beef production per hectare. Beef production per hectare was investigated under the current climate conditions, and under climate change scenarios with projections for smallest and largest climate change in the year 2050. This research was presented at the LiveM 2016 conference in Potsdam, Germany, on the 15th of June, 2016. The conference paper is submitted to Advances in Animal Biosciences.
Wageningen University, Animal Production systems group, http://www.aps.wur.nl/UK/
Wageningen University, Plant Production systems group, http://www.pps.wur.nl/UK/
Global Yield Gap Atlas, www.yieldgap.org