Male fertility is 'at its best in spring and autumn' with 117m sperm per mililitre

Earlier in the year more sperm are mobile while in the autumn more are shaped normally.

Researchers believe the combination of cooler weather, longer daylight hours and men keeping fit in these seasons is key.

Dr Taraneh Nazem of the Icahn School of Medicine at Mount Sinai, New York, said: “Maybe autumn and spring are a bit more balanced — the temperatures are mild and people are more physically active than in winter.

“They could still be eating healthily from the summer.

“Further research is needed to know how these findings affect pregnancy rates. It is something to take into consideration.”

The team looked at samples from 29,000 men over 17 years and noted which months they had been taken in.

They found there are an average 117million moving sperm per millilitre in spring, which drops to 112million in summer.

The research was presented at the American Society for Reproductive Medicine conference in Denver, US.

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