FATE OF SEMINAL PLASMA AFTER INTRAUTERINE INSEMINATION IN THE PIG

in Reproduction

The voluminous ejaculate of the domestic boar, often amounting to nearly half a litre, and the presence of 'gel' has attracted considerable comment since the studies of Lewis (1911), Rodolfo (1934) and McKenzie, Miller & Bauguess (1938). Although it is known that seminal plasma constitutes most of the large volume, the physiological function and ultimate fate of the seminal plasma after deposition in the uterus remain undecided. There has been, however, general agreement on the rapidity of disappearance of seminal plasma from the uterine horns of oestrous pigs after mating (Lewis, 1911; du Mesnil du Buisson & Dauzier, 1955; Mann, Polge & Rowson, 1956) and this was attributed either to 'backflow' through the cervical canal (Rodolfo, 1934; McKenzie et al., 1938; Burger, 1952) or to absorption from the uterus (du Mesnil du

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