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RESEARCH ARTICLE

Portal drained-viscera heat production and net flux of volatile fatty acids in Iberian pigs fed acorn

M. Lachica A , L. González-Valero A , J. M. Rodríguez-López B , L. Lara A and I. Fernández-Fígares A C
+ Author Affiliations
- Author Affiliations

A Department of Physiology and Biochemistry of Animal Nutrition, Estación Experimental del Zaidín, CSIC, Camino del Jueves s/n, 18100 Armilla, Granada, Spain.

B Unité Transformations and Agro-Ressources – UP 2018.C103, Département Sciences Agronomiques et Animales, UniLaSalle, 19 Rue Pierre Waguet, BP 30313-F- 60026 Beauvais Cedex, France.

C Corresponding author. Email: ifigares@eez.csic.es

Animal Production Science 59(8) 1470-1482 https://doi.org/10.1071/AN18149
Submitted: 23 February 2018  Accepted: 29 August 2018   Published: 16 October 2018

Abstract

The aim of the present study was to determine the portal-drained viscera (PDV) heat production (HP) and net PDV flux of volatile fatty acids (VFA: acetic, propionic and butyric acids) in Iberian pigs (34-kg bodyweight) fed with acorn from evergreen oak, and to ascertain whether there is an effect of acorn feeding over time. In addition, potential contribution of both parameters to the energy budget of the animal was calculated. The following two sampling periods were conducted with six gilts: after 1 day (I) and after 1 week (II) of acorn feeding. Postprandial PDV HP was 29% greater (P < 0.01) in Sampling period II than in Sampling period I, but net PDV flux of VFA was only slightly greater (5%, P > 0.1). Potential proportional contribution of VFA to the whole HP was almost identical in both sampling periods (0.057, on average), representing 0.109 (on average) of the metabolisable energy requirements for maintenance. Pigs adapted for 1 week to an acorn diet had increased PDV HP without an increase in the net PDV flux of VFA, indicating that, apparently, nutrients other than VFA were responsible for the increased PDV HP.

Additional keywords: energy fuel, gastrointestinal tract, nutrients.


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