The gizzard is a portion of the avian digestive tract with thick muscular walls that crush and grind food.
Figure 1. The digestive tract of a female chicken. Source: Jacquie Jacob, University of Kentucky.
Figure 2. The proventriculus (left) and gizzard/ventriculus (right) from a chicken. Source: Jacquie Jacob, University of Kentucky.
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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.