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  • Title: The removal of the seminal vesicles from the boar and the effects on the semen characteristics.
    Author: Davies DC, Hall G, Hibbitt G, Moore HD.
    Journal: J Reprod Fertil; 1975 May; 43(2):305-12. PubMed ID: 236387.
    Abstract:
    A technique is described for the removal of the seminal vesicles from the boar. The operation was carried out on twelve animals and six of the animals were subsequently trained for semen collection. The seminal plasma from the boars after surgery compared with normal litter mates had a more watery consistency and did not form the characteristic gelduring ejaculation. The sperm concentration was 49% lower while the total reduction of sperm number ejaculate was 78% in the experimental animals, but the ratio of living to dead spermatozoa remained unchanged. The concentrations of citrate and protein were significantly depressed in the seminal plasma of the animals after surgery and the pH increased; the osmolarity remained unchanged. In semination of gilts with the semen from experimental boars revealed no significant loss of fertility compared with the normal controls. Animals slaughtered up to 17 months after surgery showed no regeneration of the seminal vesicles. A technique for the removal of the seminal vesicles from boars was developed and the effects on semen characteristics were studied. The surgical technique was carried out on 12 animals; 6 of these were subsequently trained for semen collection. Removal of the glands was shown to be completely successful in 9 of the animals. Following surgery the seminal plasma had a more watery consistency and did not form the characteristic gel after ejaculation. Whole ejaculate volume and sperm concentration were significantly lower (p less than .05 and p less than .01, respectively) after removal of the seminal vesicles; however, the ratio of living to dead spermatozoa remained unchanged. Citrate and protein concentrations were also significantly depressed (p less than .01). Semen pH increased (p less than .01) and osmolarity remained unchanged. Semen from experimental boars used in the insemination of gilts revealed no marked loss of fertility compared with the controls and no regeneration of the seminal vesicles was seen when animals were slaughtered up to 17 months postsurgery.
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