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There are six main criteria for healthy sperm:. Sperm also need to have the right number of chromosomes for a successful pregnancy. A breakdown in any of these criteria can result in male-factor infertility.
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Back to Health A to Z. A low sperm count, also called oligozoospermia, is where a man has fewer than 15 million sperm per millilitre of semen. Having a low sperm count can make it more difficult to conceive naturally, although successful pregnancies can still occur.
February 14, pm Updated February 26, pm. But in the meantime, it has produced a lovely video of semen struggling to swim upstream say that five time quickly. The researchers at Cornell University built a device to mimic a fallopian tube and used human and bull semen to test it and observe how the little swimmers navigate these difficult bottlenecks.
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