Veterinary Andrology and Reproductive Techniques

CONSTRAINTS OF FROZEN SEMEN

Frozen thawed semen should be deposited either at internal os of cervix or at body of uterus for getting optimum conception rate.

• The frozen semen is inseminated invariably by the rectovaginal method only.
• Because the frozen thawed semen will have only 10 million live sperms and it will have more abnormalities and less acrosomal integrity when compared to chilled semen.

Frozen thawed semen will have only 10 million live sperms. It will have more abnormalities and less acrosome integrity than fresh or chilled semen.

• So the maximum chance should be given for the sperms to reach the site of fertilization by depositing the semen at the internal os or in body of the uterus by rectovaginal method.
• The conception rate for artificial insemination with frozen semen is low.
• There was a temporary decline in fertility rate when frozen semen was used in the field.
• The reason was investigated and traced to improper handling or deposition of semen by the inseminator.
• Thawing and insemination are the two important phases to be handled by the inseminator with utmost care.
• With chilled semen, deposition of semen either in cervix or uterus results in same conception.
• While with frozen semen, if semen is deposited in the vagina conception is almost excluded, if deposited in the cervix the conception rate is lowered and optimum conception occurs with deposition in the body of uterus.

  • The service of skilled inseminator is essential in maintaining optimum fertility in the field.
  • It has been observed that inseminators who had been inseminating for many years were only 25% accurate in semen deposition.
  • Another study is revealed that most inseminators had a tendency for too deep deposition, most frequently in to the right horn.
  • This could have a marked effect on conception in animals ovulating from the left ovary.

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