The digestive system is one of the most complex combinations of organs in the birds body.
(1) Beak, or mandibles, for picking up feed and sometimes cutting or tearing it;
(2) Gullet, through which feed passes, after being moistened in the mouth with saliva;
(3)Crop, or temperary receptacle;
(4)Stomach (proventriculus),where gastric juices is secreted and mixed with it;
(5)Gizzard,a strong muscular sac, where, by means of small stones and sharp grit (serving as teeth of the bird),the feed is ground more finely than in the mouths of many of the larger animals;
(6) Intestines, a long tube which receives the pulped material from the gizzard, subjects it to the action of several juices from the pancreas, the liver, and other glands, and absorbs the digested and desolved portions; the undigested residue passes along to the,
(7)Cloaca, where it mixes with the waste materials from the intro-urinary canal, which empties into the intestine at this point.
text from Lippincotts Farm Manuals,
Productive Poultry Husbandry,cirra 19
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