"Sheep" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure, which enables searching at various levels of specificity.
MeSH information
Any of the ruminant mammals with curved horns in the genus Ovis, family Bovidae. They possess lachrymal grooves and interdigital glands, which are absent in GOATS.

This graph shows the total number of publications written about "Sheep" by people in this website by year, and whether "Sheep" was a major or minor topic of these publications.
Bar chart showing 176 publications over 20 distinct years, with a maximum of 74 publications in 2017
To see the data from this visualization as text, click here.
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