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Single Factor Theories (VFI) (Feedback Signals (blood borne factors,…
Single Factor Theories (VFI)
Feedback Signals
blood borne factors
osmoreceptors
chemoreceptors
mechanoreceptors
oropharyngeal receptors
temperature receptors
Thermostatic & Lipostatic Control
Thermostatic
Animals eat to keep warm
Support
High hypothalamic temp= decreased FI (pigs & goats)
Cold weather= increased FI (chickens & pigs)
Decline in core temperature= metabolism of BAT (rats & mice)
Contradictory evidence
Hypothamic temp decreased before end of meal
Heating/cooling hypothalamus= no effect on FI
Cold blooded species
Lipostatic
Glucostatic Theory
Chemoreceptors (stomach & intestines)
Chemoreceptors in gastrointestinal tract detect ingested food and soluble components
Feedback to central nervous system, allows regulation of VFI as result of meal composition
Gastric Distension
Mechanoreceptors (stomach & intestines)
Domestic Swine
Birds
Ruminants
Stretching of stomach registered by mechanoreceptors.
Trigger negative feedback to reduce feed intake