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a. A pouchlike enlargement of a bird's gullet in which food is partially digested or stored for regurgitation to nestlings.
b. A similar enlargement in the digestive tract of annelids and insects.
- in vertebrates, particularly some birds, an expanded part of the oesophagus where food is stored.
- in invertebrates, an expansion of the anterior part of the gut system where food is either digested or stored.
- the agricultural or commercial fishery yield.
- in ecological terms, the difference between gross annual production and the net production - i.e. the material eaten by predators (or herbivores where the food is a vegetable), including that taken by man, and that consumed by organisms responsible for decay. See STANDING CROP.
1. a saccular diverticulum of the esophagus just anterior to the entrance to the thorax. Present in all domestic birds.
2. domesticated plants sown and harvested for use by humans.
3. a cosmetic surgical procedure carried out on the ears of dogs of certain breeds. See ear cropping.
impaction of the crop in a bird.
1. treatment of a sick bird by a flushing out, with normal saline via an esophageal tube, of food and debris from the crop.
2. see also crop wash (below).
distention of the crop with undigested food.
crumbly material, composed of lipid-laden, desquamated epithelial cells mixed with food, elaborated by both male and female pigeons in the crop and regurgitated to feed the nestlings.
a condition of domesticated birds in which the crop becomes very distended and full of feed. Sporadic cases only, but there is an inherited predisposition to gross distention in turkeys. Called also impacted crop or crop bound.
the remains of a crop after the commercially sought part of it has been harvested, e.g. wheat stubble, pea haulms, oaten straw.
used in the differential diagnosis of trichomoniasis and candidiasis and to assess crop flora in birds with regurgitation and other signs referable to upper alimentary tract disease.