Regulation of food intake metabolic expenditure cannot exceed food intake for very long if an animal is to survive one way to equalize the two processes is to decrease metabolism to a level sustainable by maximum intake which may be limited by the ability to extract food from a meagre habitat. The regulation of feed intake consists of several overlapping neural and endocrine pathways involved in negative as well as positive feedback mechanisms several centres in the brain are responsible for the capture and integration of internal and external signals. Evolution of feed intake of initial weight over time for groups of sea bass mean values held in groups of 50 and fed on demand with diets formulated to contain a graded level of lipid and designated as l low m medium and h high either unrestrictedly full line or restrictedly broken line different letters indicate statistically different cumulative feed intake p005 one way . To feed intake regulation in ruminants and the presentation of a new theory this new theory assumes that feed consumption creates both benefits to the animal in a non reproducing animal the intake of net energy for maintenance and gain and costs the total oxygen consumption of the animal it is hypothesized that for the animal the intake level where the ratio between benefits and costs
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