Different methods of collecting bird sperm produce different sperm lengths, potentially affecting the conclusions of fertility studies.
When salmon spawn, the sperm of competing males are in an all-or-nothing race to be the first to reach and fertilise the eggs.
Glutamate receptors play a central role in the human nervous system. Scientists estimate 90 percent of the human brain's synapses, or connections between neurons, send signals using glutamate. The role of similar receptors ...
Two young elephants washed out to sea were saved from drowning Sunday by the Sri Lankan navy in the second such incident off the island in as many weeks.
The size and swimming speed of sperm are controlled by a single supergene in birds, according to a new study by the University of Sheffield.
In zebra finches, sperm velocity and morphology and hence reproductive success strongly depend on a specific mutation (an inversion) on one of the sex chromosomes, called Z. This was discovered by scientists of the Max Planck ...
Scientists have found a single protein—Ptbp2—controls a network of over 200 genes central to how developing sperm move and communicate. The protein works by regulating how RNA is processed during each stage of sperm development.
Males produce hundreds of thousands to hundreds of millions of sperm within a single ejaculate depending on the species. Does it matter then which sperm is actually fertilising the egg?
Scientists have shown how the precursors of egg and sperm cells – the cells that are key to the preservation of a species – arise in the early embryo by studying pig embryos alongside human stem cells.