ANSC 3180 Lecture Notes - Lecture 15: Proventriculus, Cloaca, Esophagus
2 May 2018
School
Department
Course
Professor
Beak/bill: used for cutting, tearing, crushing, filter-feeding
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Functionally teeth replaced by gizzard
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Crop (storage)
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Proventriculus (acidic digestion)
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Gizzard (trituration)
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Stomach or abomasum replaced by…
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Duodenum, jejunum, ileum, pair ceca, rectum, cloaca (faeces and
urine)
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Digestive Strategies (includes carnivores, omnivores and herbivores)
Mouth (beak)
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Oesophagus
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Crop -proventriculus -gizzard
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Small intestine (duodenum -jejunum -ileum)
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Pair Ceaca (tiny bumps; no function)
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Colon
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Rectum
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Cloaca
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Avian Carnivore:
Mouth
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Oesophagus
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Crop -proventriculus -gizzard
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Small intestine (duodenum -jejunum -ileum)
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2 Caecum (larger)
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Colon
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Rectum
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Cloaca
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Avian Omnivore:
Mouth
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Oesophagus
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Crop -proventriculus -gizzard
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Small intestine (duodenum -jejunum -ileum)
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Paired Ceaca
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Colon
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Rectum
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Cloaca
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Avian Herbivores:
Hoatzin: only bird with foregut fermentation
Emu: mid-gut fermentation (in small intestine) *up to 60kg
Darwin's rhea: fermentation in caeca *up to 25kg
Ostrich: fermentation in colon *up to 150kg
*most northern bird (rock ptarmigan) is a herbivore
Avian Gastrointestinal Tracts
Friday,)April)7,)2017
12:19)PM
