Department of Animal Science


Date of this Version



Published in 2012 Beef Cattle Report (2012) p. 43-44. Copyright © 2012 The Board of Regents of the University of Nebraska.


The determination of the ideal breeding size of beef replacement females is traditionally centered on maximizing pregnancy rate. Relevant physical and economic relationships were combined into a bioeconomic systems model that identified key profit factors. This system-wide approach encapsulated the physical relationships with relevant costs and revenues, including annual and seasonal variations and measures relative to profitability through the application of an incomplete or modified profit function. Optimaloutcomes were relative to heifer size and management regime.