Effect of Boar Seminal Plasma on Uterine and Oviductal Motility in Oestrous Gilts
Acta Veterinaria Scandinavica
Effect of boar seminal plasma on uterine and oviductal motility in oestrous gilts. Acta vet. scand, 1980, 21, 607-616. -The effect of boar seminal plasma was tested on the muscular activity CJIf the uterine horns and of the isthmic part of the oviducts in anaesthetized oestrous gilits. The motility was recorded by using balloon-tipped catheters placed in the middle part of the uterme horns and in the isthmus close to the uterotubal junction. The following test solutions were used: sperm-free
... inal plasma and isotonic glucose solution. In the isthmic J?aiM a test solUltion called OLEP was also used. OLEP is a buffer solution with electrolyte concentrations, pH and osmotic pressure similar to seminal plasma. Neither seminal plasma nor the buUel'S used af.fected the motilirty of the uterine horns. Seminal plasma decreased the spontaneous motility of the isthmus, mainly characterized by a reduced amplitude. No effect was, however, obtained with the different buffer solutions used . It is therefore supposed that an unidentified substance with relaxative effect on the isthmic muscle is present in the boar seminal plasma. boa 1"; S em ina I p I a S In a; ute I" u s; 0 v i due t; 0 est I" US; gil t. The semen is introduced directly into the uterus during natural or artificial insemination in the pig. The spermatozoa reach the upper parts of the oviducts shortly after mating/insemination (e .g. Burger 1952, First et al, 1968 , Baker & Degen 1972 . Radiolabelled substances of different molecular sizes, mixed with seminal plasma, were present in the ampullar part of the oviducts of gilts in measurable amounts within 5 min after intra-uterine deposition . It is therefore quite clear that contractile activity of the genital tract itself must be mainly responsible for the rapid transport.