ANSC 2120 Lecture Notes - Lecture 9: Ad Libitum, Energy Economics, Victorian Football League

• School: Cornell University
• Department: Animal Science
• Course: ANSC 2120
• Professor: Debbie Cherney

Document Summary

Circle flow chart of effectors controlled variable receptors integrator(s) back to effectors and so on. E. g. growing ruminant lambs (similar to our growth trial lambs) De < 2. 5 mcal/kg intake is limited by gut fill. De > 2. 5 mcal/kg intake is regulated by energy demand. Intake is usually measured on a daily basis, but daily intake consists of a number of separate meals even if the animals are fed ad libitum. E. g. ruminants eat 10-14 meals per day: focus should therefor be on regulation of meal eating (cid:1) Regulation of feed intake and energy balance (cid:1) Feedback signals = changes in regulated variables that lead to meal eating being switched on or off: examples: Physical gut fill (distension of gut wall) Chemical blood glucose, rumen vfa, ph, osmolarity of digesta. Endocrine/neuroendocrine blood or cns concentrations of numerous hormones (e. g. insulin, gut hormones: operational features.