(drylot or pasture), replicate, and all first-order interactions. Number of cows in estrus was used as a covariate.
Scheffe’s test was used to compare means when treatment effects were significant (P < 0.05; Steel and
Torrie, 1980). Correlations between the interval to estrus after PGF2α with the number of mounts received
and duration of estrus were determined with the PROG CORR procedure of SAS.