Ruman Motility Flashcards
Who is VFA used by
Both host and microbes
What other substrate is fermented
Protein
Peptides are used by …
Microbes for growth and replication
How does host get protein
Digest microbes
Requirements of microbes provided by rumen (3)
Anaerobic
Efficient motility cycle to introduce particles to microbes
Efficient absorption of excess material including VFA
Why must VFA be absorbed quickly
Damage rumen wall
Inactivate microbes
Conditions of rumen
Substrate
37 degree
Anaerobic
Healthy flora - number removed = number made
Isotonic composition
pH
Removal of non fermentable waste
How is pH maintained in rumen (2)
Saliva
Fast absorption of VFA
How does cow saliva compare to carnivore
Isotonic
Human = hypertonic
Lots of bicarbonate to neutralise VFA
What does neutralisation of VFA cause
Lots of co2
What way have ruminants adapted for low cellulose diets
To enable growth
Recycle nitrogenous waste - urea
Is recycled through saliva - returning urea to rumen as non protein nitrogen source for microbes
Afferent input for vagus nerve received from (5)
Mouth
Distension of walls
Fibre length
pH VFA vonc - low pH stimulates
Ionic composition
Is saliva not serous or mucous
In initial saliva
Rumination saliva
Mucus
Serous - parotid gland
Where does fluid for rumen come from
Diet
Saliva
No secretions or osmotic flow
Rumen mucosa epithelium
Keratinised
