Early-life conditioning strategies to reduce dietary phosphorus in broilers: underlying mechanisms - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Journal of Nutritional Science Year : 2020

Early-life conditioning strategies to reduce dietary phosphorus in broilers: underlying mechanisms

Abstract

Chickens adapt to P and Ca restriction during the very first days of life by improving P utilisation efficiency. The present study was built to identify the mechanisms underlying this adaptive capacity, and to identify the optimal window of application of the restriction (depletion). A total of 1600 Cobb 500TM male broilers were used. During each phase (from age 0 to 4 d, 5 to 8 d, 9 to 18 d and 19 to 33 d), the animals received either a control diet (H) or a restricted diet (L) with reduced levels of non-phytate P (nPP) and Ca (between −14 and −25 % for both) with four dietary sequences: HHHH, HLHL, LHHL and LLHL. None of the feeding strategies affected growth. Tibia ash content at day 4 and 8 was impaired when the L diet was fed from 0 to 4 and 5 to 8 d, respectively (P = 0⋅038 and P = 0⋅005). Whatever the early restriction period or length between 0 and 8 d of age, the mineralisation delay was compensated by day 18. This was accompanied by an increased mRNA expression of the Ca transporter, CALB1, and an increased apparent ileal digestibility of Ca at day 8 (P < 0⋅001). This adaptation was limited to the starter phase in restricted birds. No effect was seen on P transporters mRNA or protein expression. In conclusion, birds adapted to mineral restriction by increasing Ca and nPP utilisation efficiencies. Depletion−repletion strategies are promising in improving the sustainability of broiler production but need to be validated in phytase-supplemented diets.
Fichier principal
Vignette du fichier
2020_Valable_JNS.pdf (433.14 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-02905428 , version 1 (04-08-2020)

Licence

Attribution

Identifiers

Cite

Anne-Sophie Valable, M. P. Létourneau-Montminy, S. Klein, Lionel Lardic, François Lecompte, et al.. Early-life conditioning strategies to reduce dietary phosphorus in broilers: underlying mechanisms. Journal of Nutritional Science, 2020, 9, ⟨10.1017/jns.2020.17⟩. ⟨hal-02905428⟩
97 View
82 Download

Altmetric

Share

Gmail Facebook X LinkedIn More