and replicate on the number of mounts received, duration of estrus, longest interval between mounts, and whether the longest interval between mounts was in the first or last half of estrus were determined for a completely randomized design using PROC GLM. The model included confinement area, number of cows in estrus, replicate, and all first-order interactions. Scheffe’s test was used to compare means when treatment effects were significant. Correlations among duration of estrus, number of mounts received per estrus, and number of cows in estrus were determined with PROC CORR. RESULTS