title: Urinary losses of spermatozoa during ejaculation are negligible in boars.
abstract: Boars that had a catheter implanted surgically in the urinary bladder (n = 10) were used to determine the magnitude of retrograde flow of spermatozoa into the urinary bladder during ejaculation (Experiments 1 and 2) and the post-ejaculatory retention of spermatozoa in the urethra (Experiment 2). The overall mean (+/- SD) total number of spermatozoa in the ejaculates of boars used in Experiments 1 and 2 was 62 +/- 25 x 10(9) and 65 +/- 33 x 10(9), respectively. The overall mean adjusted total number of spermatozoa in the post-ejaculation urine of boars was 106 +/- 537 x 10(6) in Experiment 1, and 41 +/- 242 x 10(6) in Experiment 2. The overall mean percentage of retrograde flow of spermatozoa into the urinary bladder was 0.15 +/- 0.78% for the boars used in Experiment 1, and 0.03 +/- 0.16% for boars used in Experiment 2. In Experiment 2, the overall mean percentage of urethral loss of spermatozoa was 0.45 +/- 1.02%, and the overall mean percentage of total urinary losses was 0.48 +/- 1.03%. These findings demonstrate that in boars, in contrast to bulls, rams, dogs, and cats, urinary losses of spermatozoa during ejaculation are negligible.
authors.affiliation: Veterinary Medical Research Institute Iowa State University Ames, IA 50011-1250 USA; Department of Veterinary Physiology and Pharmacology Iowa State University Ames, IA 50011-1250 USA.
authors.forename: P A
authors.initials: PA
authors.lastname: Martin
authors.forename: M P
authors.initials: MP
authors.lastname: Dooley
authors.forename: F B
authors.initials: FB
authors.lastname: Hembrough
authors.forename: M H
authors.initials: MH
authors.lastname: Pineda