Veterinary Andrology and Reproductive Techniques

MISCELLANEOUS FORMS OF INFERTILITY

MISCELLANEOUS MALE FACTORS RESULTING IN FAILURE OF FERTILIZATION OR CONCEPTION AND REDUCED FERTILITY.

Failure of proper delivery of semen into the vagina at the time of ejaculation may result in infertility or sterility.

• This may be secondary to lacerations of the ventral caudal portions of the glans penis with a fistulous opening of the urethra ventrally so semen is deposited in the middle portion of the vagina and not sprayed into the cranial portion or over the cervix at ejaculation.
• A similar condition may occur in rams following necrosis of most of the urethral process secondary to urinary calculi lodging in the process or due to lacerations or injury to the urethral process.

The inheritance of normal fertility or subfertility

• In males it is difficult to evaluate The inheritance of normal fertility or subfertility because of the wide variation in fertility between males and the difficulty in eliminating environment factors except in bulls used artificially on many cows.
• No studies have been made on the transmission of fertility.

The character of high fertility may be transmitted genetically; sons of highly fertile artificial sires are usually more fertile in artificial service.

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