Summary. A simple slide is described in which the base is a permeable membrane so that a suspension of spermatozoa (or other cells) may be examined under controlled conditions with a microscope. An objective method of assessing the motility of spermatozoa in undiluted or diluted semen from a wide variety of species including cattle, horse, pig, rabbit, rat and sheep is described. It is shown to be well correlated with other methods of assessing motility and also with the non-return rate obtained with frozen cattle semen.
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