Bayer gag

Bayer gag

used in the examination of a cow's mouth. A metal block with opposite faces shaped as grooves into which molar teeth slide, on a long steel rod. The block is pushed up between the molar teeth on the opposite side. The retaining rod has a loop and is tied to the headstall to prevent the block from moving. The Swale and Young gags are similar. See also mouth wedge.
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