Usage History of 'estrus'

The following chart shows how frequently 'estrus' appeared in printed materials over time. For example, the word 'estrus' occurred 2 times in books in 1778 and 9,680 times in 2008. From 1778 to 2008, the word 'estrus' was used a total of 355,468 times in books scanned by Google. See Reference: Google Ngram project.

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