By H. J. Leese (auth.)
Read or Download Human Reproduction and in vitro Fertilisation PDF
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Additional resources for Human Reproduction and in vitro Fertilisation
In addition to the work 28 to be described, he discovered the oestrous cycle, and invented a highspeed camera! " He described what he did: "On the 27th April, 1890, two ova were obtained from an Angora doe rabbit which had been fertilised by an Angora buck thirty-two hours previously; the ova were undergoing segmentation, being divided into four segments. The ova were immediately transferred into the upper end of the fallopian tube of a Belgian doe rabbit which had been fertilised three hours before by a buck of the same breed as herself ...
5-6 cm 3 , a sperm concentration greater than 20-30 million/cm 3 , and 60 per cent of the sperm will be motile and normal-looking. If any of these parameters are not met, it does not necessarily mean that anything is wrong, since abnormal sperm tests are not uncommon. Repeated values below normal indicate that further tests are required. These include testing the ability of sperm to swim (page 19), and the so-called 'postcoital test'. In this, the couple are asked to have intercourse about 8 hours or more before the expected time of ovulation (probably based on temperature charts, though preferably on LH monitoring).
Once deep-frozen, they may be stored in liquid nitrogen at a temperature of -196°C. The evidence to date suggests that they may be stored indefinitely in this condition.