Least square means within a row with different letters (x–y) are different (P < 0.05).
a
Sex: G = gilt; PC = physical castrate; EM = entire male; IC = immunological castrate.
b
Standard error of the mean.
c
Scored on a 1 to 10 scale (NPPC, 1999).
d
Scored on a 1 to 6 scale (Japanese color scale; Nakai et al., 1975).