Nutrition, more specifi cally energy intake, is the
environmental factor that most infl uences reproductive
function in beef females (Mass, 1987). Several research
studies demonstrated that energy intake can be
1The Eastern Oregon Agricultural Research Center, including the
Burns and Union stations, is jointly funded by the Oregon Agricultural
Experiment Station and ARS-USDA. Appreciation is expressed to
Flavia Cooke and Arthur Nyman (Oregon State University) for their
assistance during this study.
2Corresponding author: reinaldo.cooke@oregonstate.edu
Received November 26, 2011.
Accepted March 20, 2012.