Increase sperm production in hogs
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Pig Advance Could Boost Prized Sperm Stocks
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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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