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SPERM OUTPUT OF RABBITS AT VARIOUS EJACULATION FREQUENCIES AND THEIR USE IN THE DESIGN OF EXPERIMENTS

Summary.: Each of twelve rabbits was ejaculated for 5-week periods at frequencies of: once a week (1 x F) ; four times on Friday (4 x F) ; twice on Monday, Wednesday and Friday (2 x MWF) ; and once daily except Sunday (1xM-S). Average sperm outputs/ejaculate (x10⁶) for the four ejaculation frequencies were: 273 for 1 x F; 114, 207, 141 and 80 for first, second, third and fourth ejaculates, respectively, at 4xF; 78 and 128 for first and second ejaculates, respectively, at 2 x MWF; and 86 for 1 x M-S. Repetitive ejaculation significantly increased weekly sperm output (P<0·01). Component of variance analysis of weekly sperm output indicated that differences among bucks were magnified by the more intensive ejaculation frequencies, but not as much as average sperm output.