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OVA Transport and Fertility after Resection of the Oviductal Isthmus in Pigs
Äggtransport och fertilitet efter resektion av istmusdelen av äggledaren hos svin
Acta Veterinaria Scandinavica volume 26, pages 218–230 (1985)
Abstract
The effect upon the reproduction of total resection of the oviductal isthmus, including the uterotubal and ampullary-isthmus junctions followed by end-to-end ampullo-cornual anastomosis was studied in pigs. Normal cycling gifts of proved fertility were submitted to bilateral isthmus deletion (Group I). Other gilts were submitted only to unilateral isthmic resection, while their contralateral medial isthmus was transversally cut and reanastomosed (Group II). A significantly lower nidation index was obtained after bilateral isthmic resection. The gilts in Group I which did not become pregnant and those in Group II were successfully mated during forthcoming standing oestruses, and were in association to that slaughtered on days 3, 4, or 5 of the cycle, and the characteristics and location of ova were determined. Spermatozoa fertilized the ova, and those cleaved normally in the isthmic-resected tube as well as in the sham-operated oviducts. The isthmic-resected oviduct, however, did not transport cleaved ova into the uterus at the time expected as normal. The findings suggest that the fertilized pig ova cannot reach the uterus at the normal expected time in case of total absence of the isthmic part of the oviduct, resulting in impaired fertility.
Sammanfattning
Ändamålet med denna undersökning var att studera inverkan av totalresektion av istmus på fertiliteten hos svin. Normalt cyklande gyltor med tidigare dokumenterad fertilitet användes för dubbelsidig istmusresektion (Grupp I). På några andra gyltor gjordes enbart ensidig istmusresektion, medan den kontralaterala sidans istmus delades transversalt och reanastomoserades (Grupp II). Signifikant lagre befruktningsindex erhölls efter dubbelsidig istmusresektion. De gyltor i grupperna I och II som inte blev dräktiga betäcktes vid efterföljande brunst. Gyltorna slaktades dag 3, 4 eller 5 i cykeln och äggen lokaliserades och bedömdes. Spermierna befruktade äggen och äggen delade sig normalt i den shamopererade äggledaren såväl som i den äggledare där istmus bortopererats. Den äggledare som saknade istmusdelen transporterade emellertid inte ner äggen i livmodern vid förväntad tidpunkt.
Resultaten visar att äggens förflyttning till livmodern är fördröjd då istmusdelen är bortopererad. Detta resulterar i dålig fertilitet.
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Rodriguez-Martinez, H., Larsson, B. & Einarsson, S. OVA Transport and Fertility after Resection of the Oviductal Isthmus in Pigs. Acta Vet Scand 26, 218–230 (1985). https://doi.org/10.1186/BF03546553
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DOI: https://doi.org/10.1186/BF03546553