THE OESTROUS CYCLE OF RATS AT HIGH ALTITUDE

in Reproduction

Summary.

Rats were exposed to an altitude of 14,000 ft for up to 90 days, either in natural cold or at 23° C. An initial tendency to anoestrus was probably due to the sudden change of environment. After about 30 days there was prolonged oestrus, probably as a result of low oxygen pressure. Oestrus was not as prolonged among the cold-exposed animals as among those at 23° C, evidently owing to the anoestrous effect of cold. Recovery usually occurred on descent to sea level.

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