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Simulation of growth in pigs: evaluation of a model to relate thermorégulation to body protein and lipid content and deposition

Published online by Cambridge University Press:  18 August 2016

P.W. Knap
P.W. Knap*
Affiliation:
PIC Group, Fyfield Wick, Kingston Bagpuise, Abingdon OX13 5NA
*
Stationed at the Roslin (Edinburgh), Roslin, Midlothian EH25 9PS. Correspondence to this address.
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Abstract

A dynamic model for simulation of growth in pigs was extended by a module to assess maximum and minimum heat loss (HLcold, HLhot) for a given pig, to compare these figures to heat production (HP), and to take thermoregulatory action when HP < HLcold (cold conditions) or HP > HLhot (hot conditions).

HLcold and HLhot were largely determined according to algorithms obtained from the literature, hut HLcold was made dependent on body fat depth through tissue insulation. Data to establish the relation (Ύ = 0.05 + 0.002 x X) between cold tissue insulation (Ύ in °C.m2 per W) and backfat depth (X in mm) independent of body weight were obtained from the literature. The same data showed that HLhot is not related to backfat depth in pigs.

Cold thermoregulatory action included an increase of ad libitum food intake. Hot thermoregulatory action included reduction of physical activity, increase of body temperature, wetting of a proportion of the skin and reduction of dia libitum food intake.

A sensitivity analysis showed that the model’s output in terms of ãd libitum food intake, HP, protein deposition (Pdep) and lipid deposition (Ldep) is strongly sensitive to the characterization of the genotype being simulated. The model was used to simulate trials from the literature. Although the model does not explicitly calculate lower and upper critical temperatures, these could be adequately predicted from its output. Comparison of model output with experimental data revealed an adequate prediction of ad libitum food intake and of the partitioning of ad libitum ingested metabolizable energy (ME) into HP, Pdep and Ldep in cold, thermoneutral and hot conditions. At restricted ME intake, and especially in cold conditions, the model tends to overestimate HP and underestimate Ldep, probably because it does not take account of long-term acclimatization.

Keywords

body compositionmathematical modelspigsthermorégulation
Type
Research Article
Information
Animal Science , Volume 68 , Issue 4 , June 1999 , pp. 655 - 679
Copyright
Copyright © British Society of Animal Science 1999

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