LiGAPS-Beef

Submitted by marcel.lubbers on Fri, 07/08/2016 - 08:50
General
Name
LiGAPS-Beef (Livestock simulator for Generic analysis of Animal Production Systems)
Program type
Livestock growth simulation model / R 2.15.3
Available since
Description

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.

Scale of application
animal and herd (farm)
Spatial resolution
farm
Key outputs

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)

Time horizon
life cycle of a beef cow
Time step of modeling
one day
Required to run

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.

Required to develop

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.

Database I/O
Files with daily weather data (.csv extension). Results from LiGAPS-Beef can be written to files with various extensions (.csv, .pdf., .txt, .xls).
Examples

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.

Author(s)
Aart van der Linden, Gerrie W.J. van de Ven, Simon J. Oosting, Martin K. van Ittersum, and Imke J.M. de Boer
Address
Animal Production Systems group, Wageningen University, P.O. Box 338, 6700 AH Wageningen, The Netherlands
Website

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