Washington: Disruptions to the circadian rhythm or the body`s biological clock may cause fertility problems, a new study has claimed.A team at Northwestern University in the US disrupted the circadian rhythms of female mice for five to six days after they mated. One group of 18 mice got an extra six hours of light, while another 18 mice lost daylight.By the end of the experiment, only half of the mice with extra daylight had litters and mice that lost daylight fared worse -- only 20 per cent gave birth. But 90 per cent of a control group exposed to a steady 12 hours of daylight gave birth, found the study published in the journal PLoS ONE.
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