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A systematic review and meta-analysis Ca digestibility and utilisation in growing and finishing pigs

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

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Abstract

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.

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

URL: https://doi.org/10.1139/cjas-2018-0140

DOI: 10.1139/cjas-2018-0140

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