The diseases of poultry (1899) The diseases of poultry diseasesofpoultr00salm Year: 1899 Gannet. DISKASrJS OI'' HOUlvTRY. 85 cuius is slight, and with those l)irds which live ui)on vegetable substances the food is fed to it gradually and almost constantly from the crop. Birds insecl?. fruits, or flesh exclusively have either no crop or only a simple dilatation of the oesophagus, as such food is easily digested. In the walls of the pro - ventriculus are the gas- tric glands which secrete the gastric j uice required for the digestion of the albuminoid constitu- ents of the food. The
The diseases of poultry (1899) The diseases of poultry diseasesofpoultr00salm Year: 1899 Gannet. DISKASrJS OI'' HOUlvTRY. 85 cuius is slight, and with those l)irds which live ui)on vegetable substances the food is fed to it gradually and almost constantly from the crop. Birds insecl?. fruits, or flesh exclusively have either no crop or only a simple dilatation of the oesophagus, as such food is easily digested. In the walls of the pro - ventriculus are the gas- tric glands which secrete the gastric j uice required for the digestion of the albuminoid constitu- ents of the food. The different forms assumed by the gastric glands in various species of birds are illustrated in Fig. 16. Tlie simplicity or complication of glands indicates to a certain extent the kind of food which is natu- ral to the species. The gastric juice may digest flesh, fish, and ground feed while still in the proventriculus, but it can not act upon grains and seeds until these have been crushed in the gizzard. Catarrh or inflammation of the mucous membrane of the stomach is a not uncommon disease, and one which seriously interferes with tjie vigor and Turkey. Rhea. Ostrich. Fig. 16.—Gastric plands of birds.
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