DEVELOPMENT OF TRANS-CERVICAL ARTIFICIAL INSEMINATION IN SHEEP WITH SPECIAL REFERENCE TO ANATOMY OF CERVIX
Keywords:
Trans-cervical artificial insemination, frozen-thawed semen, cervix, cervical relaxation, eweAbstract
Artificial insemination has an important role in the sheep industry and sheep genetic improvement.The complexity of the sheep cervix limits the development of trans-cervical artificial insemination.The sheep cervix is a long convoluted tubular organ with internal rings. The internal cervical ringsform the funnel-like shape of the cervical canal which is the physiological barrier situated inside thecervical canal. The cervical opening is formed by the internal cervical fold which varies with 5 typesof cervical opening including duckbill, slit, rose, papilla and flap. The internal ring is arranged intogrades 1, 2, and 3 according to the complexity of the internal fold alignment. These complicatedstructures of the anatomy of the sheep cervix reduce the ability of the passage of the inseminationpipette into the uterine body. The study of the cervical relaxation mechanism and the sheep cervixanatomy is important for the development of trans-cervical artificial insemination in sheep.The administration of an exogenous substance induces the cervical relaxation and enhances thepossibility of the success of TCAI in sheep.
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