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.
Author(s): Misiura MM, Filipe JAN, Walk CL, Kyriazakis I
Publication type: Article
Publication status: Published
Journal: Canadian Journal of Animal Science
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
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