having several estrus cycles annually or during a breeding season.

1895–1900; poly- + estrous

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Medical Dictionary

polyestrous pol·y·es·trous (pŏl'ē-ěs'trəs)
Ovulating more than once a year.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
In fact, bush dogs may be polyestrous, a marked divergence from the canid norm.
The females are polyestrous and can produce a maximum of five litters annually.
Females tend to be seasonally polyestrous, with a cycle lasting about three
Wild burros are polyestrous and can breed and give birth throughout various
  times of the year.
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