It is known that steroid replacement
can maintain libido after castration of boars [4,5], but
the degree of estradiol suppression in the present study
was sufficient to eliminate all desire to mount the
artificial sow in all boars by 26 d after castration. The
estradiol suppression and lack of interest in mounting an
artificial sow are consistent with Louis et al. [2], who
reported that boars with blood estradiol concentrations
of 52 pg/mL refused to mount an artificial sow