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Facteurs de variation de la biodisponibilité du zinc, ajouté sous forme organique ou inorganique, chez deux espèces monogastriques en croissance (poulet et porcelet)

Abstract : Zinc is an essential element, a heavy metal for the environment and a non renewable resource. Phytates are identified as the main dietary factor limiting Zn bioavailability in monogastrics. Organic Zn sources (DZNO) are supposed to interact less with dietary phytates than inorganic sources (DZNI). Dietary Zn bioavailability was therefore studied in function of dietary phytate contents on rats, broilers and piglets. The in vivo experiments and the two meta-analysis allowed to evidence the following : 1) In presence of sodium phytate, Zn absorption from DZNO is improved compared to DZNI, suggesting that DZNO is, at least partially, protected against this antagonist. 2) However, Zn bioavailability from DZNO, is not improved compared to sulfate in broilers and piglets fed diets containing vegetal phytate. The vegetal phytate antagonism acts on native Zn only. 3) The antagonism of vegetal phytate on Zn bioavailability is more pronounced in piglets than in broilers. Our results indicate that the lower gastric pH from broilers compared to piglets, allows the birds to use Zn from feed ingredients with vegetal origin, initially bound to phytates. 4) For an optimal Zn supplementation in pigs, we suggest, in addition of the Zn contents of feed ingredients, the use of a new variable "non hydrolysed phytic P". This variable takes into account the dietary vegetal and microbial phytase activity. This way, Zn supplementation can be adapted in function of the antagonistic potential of non hydrolyzed dietary phytates. The natural capacity of broilers to use Zn from vegetal feed ingredients limits the potential improvement of dietary Zn utilization in this specie.
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https://pastel.archives-ouvertes.fr/pastel-00536407
Contributor : Patrick Schlegel <>
Submitted on : Tuesday, November 16, 2010 - 11:11:05 AM
Last modification on : Monday, October 19, 2020 - 11:02:34 AM
Long-term archiving on: : Saturday, December 3, 2016 - 12:31:34 AM

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  • HAL Id : pastel-00536407, version 1
  • PRODINRA : 246164

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Patrick Schlegel. Facteurs de variation de la biodisponibilité du zinc, ajouté sous forme organique ou inorganique, chez deux espèces monogastriques en croissance (poulet et porcelet). Alimentation et Nutrition. AgroParisTech, 2010. Français. ⟨NNT : 2010AGPT0054⟩. ⟨pastel-00536407⟩

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