A mathematical model of the United States beef production system

• Published in: Agricultural systems Vol. 5; no. 4; pp. 295 - 307
• Main Authors: Miller, W.C., Ward, G.M., Yorks, T.P., Rossiter, D.L., Combs, J.J.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.1980; Elsevier
• Series: Agricultural Systems
• Subjects: United States
• ISSN: 0308-521X; 1873-2267
• DOI: 10.1016/0308-521X(80)90053-0

Dynamic linear programming was used to model the US beef production system, to determine the cattle cycle effects on feeder cattle supplies and to select feeding options that would maximise USDA choice and prime quality grade beef production. The model represented the US as a five-region beef production system with inter-regional transportation of offspring for feeding purposes. Cow weights, offspring weaning weights and feed efficiency were different for each region, but the feeding activities were the same in each region except for region two. In region two the feeding of grain to steer and heifer offspring was not an industry practice. Dynamic properties of the model were achieved through constraints that transferred animals from year zero (initial condition) to year five using calving, cow culling, replacement heifer and death loss rates as controlling parameters. The results of model exercises that used historical parameter values indicate that there will be a significant decrease in the supply of beef at all grade levels over the next five years. They also suggest that it is more economically efficient to feed calves from the southeastern and northern parts of the USA if they are transported to the southwestern region.