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The large amount of semen that the boar produces makes it a particularly suitable animal for observations on the activity of the accessory glands. The most comprehensive study that has been made on this subject is that of McKenzie, Miller & Baugess [1938] who describe the volume, sperm count and chemical composition of numerous collections from normal boars and from those whose seminal vesicles, Cowper's glands and prostates had been removed, as well as after vasectomy and castration.
In other species measurements of seminal secretion obtained by artificial stimulation have been used to follow the activity of the accessory glands, for example, by Moore & Gallagher [1930] in the guinea-pig and by Huggins & Clark [1940] in the dog (prostatic secretion only). These authors found considerable fluctuations in the volume normally produced and a marked reduction after castration. Huggins & Clark also observed a rapid reduction in prostatic secretion after
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