Male type: altered male (A); contemporary males (N); VOL: volume (ml); CON: sperm concentration (106/ml);MOT (%): percentage of total motile
sperm; NAR (%): percentage of sperm with normal apical ridge; ANR (%): percentage of abnormal sperm; a,b Values in the same column with
different superscripts are statistically different (P < 0.05). (n): number of ejaculates.