Increase sperm production in hogs











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Boar management and semen handling factors affect the

However, increasing or decreasing light length in the opposite season can advance the age of puberty. In production settings, the critical event, which begins the reproductive process, is the meeting of sperm and eggs inside the female reproductive tract. Perhaps the clearest example of the effects of breed on boar fertility is illustrated when comparing Chinese Meishan boars with conventional breeds of European origin. As sperm leave the testicle, they enter the head of the epididymis. FSH stimulation of the testes starts the process of sperm production spermatogenesis by initiating sperm cell division and development. This means the sperm that are produced leave the testes from the bottom, move up, and are stored near the top of the testicle. The reason for the delay and length of the appearance of abnormalities depends upon the day transport in the epididymis and the sperm cell stages during the day development period. In the case where both testes fail to descend into the scrotum bilateral cryptorchidism , these males are completely sterile even though testosterone levels are normal and they appear to act like fertile males. The boar continues to increase testes size and spermatogenic output after puberty, and it has been reported that boars less than 9 months of age have both lower ejaculate volumes and concentrations compared to boars 18 months of age or older. Sexual stimulation initiates smooth muscle contractions in the tail of the epididymis and the vas deferens. Another muscle called the cremaster, is found in the spermatic cord and contracts or relaxes in order to pull the testis closer to the body in cold weather or let them hang further away in hot weather. It is reported that sperm first lose their ability to fertilize an egg, and then they lose their motility, and lastly the are observed to disintegrate.

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Description: The process of spermatogenesis is highly dependent upon temperature and is especially sensitive to elevated temperatures. Libido and ejaculate volumes are lower in boars raised in physical isolation from other males or females. Perhaps the clearest example of the effects of breed on boar fertility is illustrated when comparing Chinese Meishan boars with conventional breeds of European origin. Recently much attention has been directed toward the importance and function of these fluids. However, although they are capable of movement, they are still too concentrated to permit motion. Sexual stimulation min restraint of the boar prior to ejaculation has been shown to dramatically increase the concentration and volume of the boar ejaculate. This age is not well established, since there has been a high rate of boar turnover with rapid genetic improvement. The boar continues to increase testes size and spermatogenic output after puberty, and it has been reported that boars less than 9 months of age have both lower ejaculate volumes and concentrations compared to boars 18 months of age or older. Failure of one of the testicles to descend is called unilateral cryptorchidism and can lead to a male that is normal in appearance but with reduced spermatogenic capability. The boar usually takes minutes to ejaculate the ml volume. The other gonadotropin, LH, is responsible for initiating testosterone production by the Leydig cells. In this arrangement, warmed arterial blood entering the testes is cooled by the returning venous blood leaving the testes. This can become quite odorous. The FSH molecule actually binds to Sertoli cells, which serve as nurse cells for the forming sperm cells Figure 4. In the case where both testes fail to descend into the scrotum bilateral cryptorchidism , these males are completely sterile even though testosterone levels are normal and they appear to act like fertile males.
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