Exact(5)
The first involves choosing the type of sperm that is used to fertilise the woman's egg.
The percentages of each type of sperm morphology were variable across both T stallions and F stallions.
However, there did not appear to be any striking difference in the type of sperm head abnormalities encountered in these three groups of males and no significant differences (p > 0.05) were found in their sperm morphometry.
This type of sperm competition (a 'fair raffle') can lead to selection for more, and further miniaturized, male gametes as limited resources are allocated to create more individual gametes [ 2, 3].
We measured swimming velocity of both type of sperm and found no difference between sneakers and consorts (consort curvilinear velocity = 167.7 ± 36.9 μm/s, n = 6, 1421 cells; sneaker velocity = 167.1 ± 33.5 μm/s, n = 3, 619 cells; Mean ± SE, Student's t-test, P = 0.745).
Similar(55)
Perhaps the first example of mammalian sperm cooperation, the finding may cause scientists to look for coordination among all types of sperm.
Like many insects, Drosophila has two types of sperm storage organs, the spermatheca and seminal receptacle, whose ducts arise from the uterine wall.
In view of the differences in fertility between rats and humans, these types of sperm effects in rats suggest the potential for an impact on human male fertility that would be undetected if not for the sperm assessment.
The male can inseminate the hermaphrodite, which will preferentially use male sperm (both types of sperm are stored in the spermatheca).
Abnormal spermatozoa were present in both types of sperm samples normal and abnormal.
Because of the numerous types of sperm shape, the efficiency and accuracy relying on human assessment are not ideal.
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