VGO 511: Veterinary Andrology and Reproductive Techniques (1+1)

METHODS OF SEMEN COLLECTION IN BOARS

The semen can be collected by

• Gloved hand method
• Artificial Vagina method
• Electro ejaculation method

Gloved hand method

• The boar is allowed to mount the estrual female or phantom.
  • The operator stands on the right side of the dummy
  • As the boar mounts the penis will protrude
  • Catch the twisted glans penis in gloved hand and exerts pressure on it.
  • Relaxation of the pressure will lead to interruption of ejaculation.
  • Once the ejaculation is started the pressure should be maintained until the ejaculation completed.
  • The semen is collected in a sterile vial.

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Artificial vagina method

• The boars penis is spirally twisted counter clock wise.
• The artificial vagina should be able to adopt this spiral type of penis to get complete ejaculation.
  • The length of boar AV- 12.5 cm, Diameter - 4.5 cm.
  • Inner liner diameter - 40 cm, diameter 3-3.5 cm.
  • Inside the AV is filled with a heavy rubber casing of 12.5 cm of 4.5 cm diameter of a rubber sponge.
  • The temperature of AV is about 45-50^oC. This rubber casing adopts the cork screw penis and exerts pressure over the penis.
  • The AV is passed over the penis and several back and forth movements was done to lock the penis in the casing.
  • The ejaculation commences and continues for about 15 minute with the sperm rich fraction being emitted on 3^rd or 4^th minute. Frequently these may be a series of sperm rich fractions interspersed between periods of this sperm fractions and gelatinous tapioca like secretions.
  • Nishikawa of Maule designed a AV in corporating a heavy spiral ring with in the vagina to stimulate the fold’s of the sow’s genital tract.

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Electro ejaculation method

• Electro ejaculation in boar was described by Dzuik and his coworkers and Adams et al. (1969).
  • The rectum is made free of faeces and the probe is inserted. Electric current of 12-20 volts at 5 to 10 second interval is passed to obtain ejaculation.
  • Boar must be forcibly restrained and collection is a noisy drawn out affair, resulting in a heavily contaminated ejaculate.
  • Some author described about collection of semen in anaesthetized boars.
  • Here the genital organ may be thoroughly cleaned and the penis was removed from the sheath, held by the hand and electro ejaculator is applied so the semen would flow in to collection cup.
  • But the disadvantage of collecting semen from the anesthetic, pigs were inability to observe boar’s libido this actions at coitus non physiologic ejaculate of largely free of accessory gland secretion.
  • The electro ejaculation method of semen collection is not satisfactory in boars as in buck and rams

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