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Slide 1 - Digestion in Ruminants & Rodents
Slide 2 - Ruminants Herbivore mammals Eg. Cow, goat, giraffe, deer Feed on plant - cellulose
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Slide 4 - Rodents.. Rabbits and rats family
Slide 5 - Digestive System of Ruminants Feed on plant – cellulose Need cellulase to digest it But ruminants do not produce cellulase However their digestive system are specially adapted to carry out cellulose digestion
Slide 6 - Ruminants.. Has a stomach with 4 chambers: 1. rumen 2. reticulum 3. omasum 4. abomasum Carry out rumination – process of regurgitating food and rechewing it
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Slide 9 - Ruminants.. the saliva of a cow contains no salivary amylase To digest the plant material, herbivores need to depend on the cellulase-secreting microorganism in its digestive system
Slide 10 - Ruminants.. Rumen - first & largest compartment - contain bacteria that produced cellulase for the cellulose digestion - function as the fermentation chamber
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Slide 13 - Organisms in rumen
Slide 14 - Ruminants.. Reticulum - also contains bacteria for digestion - content of reticulum called cud - regurgitation occurs - has a ‘honeycomb’ wall
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Slide 17 - Ruminants.. Omasum - reswallowed cud will be sent here - large particle are broken down by peristalsis - water is removed
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Slide 20 - Abomasum - true stomach of the ruminants - gastric juice containing digestive enzymes - HCl and pepsin Ruminants..
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Slide 22 - Flow of food in ruminant mouth oesophagus rumen mouth omasum reticulum abomasum regurgitation fermentation curd swallow swallow - H2O chyme
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Slide 24 - rumen reticulum abomasum omasum
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Slide 26 - Digestive System of Rodents Their caecum and appendix are enlarged to store the cellulase producing bacteria Food pass the alimentary canal twice - first as food - then as soft faeces
Slide 27 - Soft and watery faeces usually produced at night Eaten again Pass out as hard and dry faeces during the day
Slide 28 - Rat digestive system
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Slide 33 - Rat’s caecum
Slide 34 - Flow of food in rodents mouth oesophagus stomach caecum anus Small intestine swallow Re-eat the faeces to absorb more nutrient Digest cellulose
Slide 35 - Eaten again? Why?? to enable the animals to absorb the products of bacterial breakdown allow rodent to recover the nutrients initially lost with the faeces
Slide 36 - Eaten again? Why?? nutrient is absorb in the small intestine but in rats, the microorganism that help to digest cellulose is in the caecum, the food must pass the small intestine before entering the caecum So the faeces eliminate is actually soft and rich in nutrient That’s why they have to re-eat the faeces in order to absorb all the nutrients
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