How long have you had chickens? I feel that you should maybe do a little research on basic care of chickens because this is Chicken Keeping 101. I really don’t mean that in any bad way, just trying to push you in the right direction.
Chicken’s don’t have teeth or stomachs like we do. Chickens have a crop which is like their lunchbox. When they eat, the crop stores their food until it’s ready to move into the rest of the digestive system. From there it goes into the gizzard. Chickens must eat small pebbles which end up in the gizzard. The gizzard is a very strong muscle which contracts. This contraction, combined with the pebbles, is what grinds the food into a digestible state. From there it moves into the intestinal tract, and finally is expelled as waste. Please don’t chase your chickens away from pebbles. In theory, if a chicken only ate chicken feed, it is already ground up and processed enough that pebbles ate not necessary, but any chicken that has access to the outside will eat little bugs, grass, and pebbles.
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Chickens need a well balanced feed. If they are intended for egg laying, then chicken feed intended for layers, all-flock feed, or grower feed are all suitable. Chickens intended for laying must also have oyster shells available in a separate container at all times to ensure they have adequate calcium.