Percentage of intact sperm recovered in Study 2. Sperm counts tallied both intact sperm and sperm heads not attached to a tail. The number of intact sperm was expressed as a percentage of the total number of sperm recovered. *, Group 9 was statistically lower than Groups 8, 13 and 14 by Tukey's post-test (p < 0.01). §, Group 12 was statistically lower than Group 13 by Tukey's post-test (p < 0.05).