Lookup NU author(s): Maciek Misiura,
Dr Joao Filipe,
Professor Ilias Kyriazakis
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Development of dietary recommendations based on digestible Cavalues is an essential step to optimise pig performance and feedconversion (González-Vega and Stein 2016) because present guidelines,expressed on total dietary Ca (NRC 2012) are inadequate, asthey ignore endogenous losses and the digestion process. A systematicreview and meta-analysis of digestibility trials were performedto quantify factors affecting Ca absorption and retention, and toestimate endogenous Ca losses. Forty studies, corresponding to 201dietary treatments performed on 1204 growing pigs, were selected.Data analysis was performed in R using weighted linear mixedeffects regression. The results indicated that while Ca absorptionand retention [g kg−1 of body weight (BW) d−1] increased withincreasing Ca (P < 0.001), nonphytate-P (P < 0.001), and exogenousphytase intakes (P < 0.001), these responses decreased with increasingphytate-P intake (P < 0.05). Interactions between exogenousphytase and Ca intake, indicating reduced efficacy of this enzyme(P < 0.001), and between phytate-P intake and exogenous phytase,counteracting the direct negative effect of phytate-P (P < 0.05) onCa absorption and retention, were detected. There were no effectsof animal-related characteristics (e.g. genotype) on Ca absorptionand retention. The large amount of variance explained in Ca absorption(90%) and retention (91%) supported our a priori choice ofindependent variables. Estimated endogenous Ca losses were239 mg kg−1 of dry matter (95% CI: 114–364); when scaled byBW, the endogenous Ca excretion on Ca- and P-free diets was20.5 mg kg−1 of BW d−1 (95% CI: 5.46–36.5). These outcomes shouldcontribute towards establishing digestible Ca requirements, andthus, for more accurate formulation of pig diets.
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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