When feed enters a chicken’s gizzard, it undergoes mechanical digestion. The gizzard is a muscular part of the digestive system that grinds and crushes food, aided by small, hard particles like grit or stones that the chicken has ingested. This grinding action helps break down the feed into smaller, digestible pieces, similar to chewing in mammals.
Food swallowed directly or passed on from the crop enters the proventriculus, where digestion is initiated via stomach acids and enzymes. The partially digested food then passes into the muscular gizzard where it is physically processed, often with the help of gastroliths
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