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Exploring the mechanisms of control of feed intake underdiets of differing P content in growing and finishing pigs

Lookup NU author(s): Maciek Misiura, Dr Joao Filipe, Professor Ilias Kyriazakis


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An investigation of two feed intake regulation mechanisms wasperformed for growing pigs across scenarios of differing dietaryphosphorus (P) content. Under mechanism 1: “animals attempt toeat for the first limiting nutrient”, pigs are expected to consumea feed amount seeking to satisfy maintenance and growth requirementsof the most deficient nutrient, subject to physiological constraints(Ferguson et al. 1994). Consequently, pigs fed P-limitingdiets should increase their feed intake relative to pigs initiallyfed P-adequate diets. Under mechanism 2: “animals attempt toeat for energy only”, feed intake is controlled by the energyrequirement for maintenance and growth (subject to constraints),and is dietary-P-independent when this nutrient is first limiting.Two mechanistic models, each incorporating one of the aforementionedmechanisms, were developed in R to simulate feed intakeand animal growth, which was then fitted to published experimentaldata. In both models, feed intake was constrained by thegut size and the heat dissipation capacity; potential excess energyintake was deposited as lipids; and growth of body componentsand P was driven by allometric relationships to protein (Symeouet al. 2014). Pig genotypes were characterised by protein and lipidweights at maturity, which were estimated using ApproximateBayesian Computation. A preliminary analysis suggests that pigsdo not appear to modify their feed intake on P-deficient diets, indicatingthat mechanism 2 provides a better description of theunderlying feed intake regulation.

Publication metadata

Author(s): Misiura MM, Filipe JAN, Walk CL, Kyriazakis I

Publication type: Article

Publication status: Published

Journal: Canadian Journal of Animal Science

Year: 2018

Volume: 98

Issue: 4

Pages: 902-906

Print publication date: 01/12/2018

Online publication date: 28/11/2018

Acceptance date: 16/08/2018

ISSN (print): 0008-3984

ISSN (electronic): 1918-1825

Publisher: Agricultural Institute of Canada


DOI: 10.1139/cjas-2018-0140


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