Fig. 1. Comparison of empirical cumulative distribution functions of partial returns per cow at time of weaning for heifers (Panel A = Heifers) and steers (Panel B = Steers) born in 2000 through 2002. Production systems are defined by the number of paddocks and implies rotation frequency (2 is rotating twice monthly and 8 is rotating twice weekly) whereas the letter represents early (E) weaning in April vs. 56 d later (L). The number of observations is presented in parentheses for each production system. PR = partial returns.