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Dynamic modelling of contractile and metabolic properties of bovine muscle

Abstract : During bovine growth, a dynamic multifactor process influences the development of muscle characteristics that influence meat quality. This paper fits non-linear equations to data from growing cattle in order to provide a mathematical description of the development of contractile and metabolic muscle characteristics. The muscle characteristics considered were: the mean cross-sectional area of muscle fibres, fibre type proportions and the glycolytic and oxidative enzymatic activities represented by lactate dehydrogenase (LDH, glycolytic) and isocitrate dehydrogenase (ICDH, oxidative). The Gompertz equation was used to describe the increase in fibre cross-sectional area as cattle mature. The proportion of oxidative fibres in the muscle was modelled using a 3-parameter equation to denote an initially fast increase in the proportion of oxidative fibres which then slowed with increased degree of maturity. A 4-parameter equation represented the proportion of glycolytic fibres and LDH activity in the muscle which increased with increasing maturity and then decreased after puberty. An equation was fitted to the data of ICDH activity in the muscle which had an exponential decrease followed by a linear increase with increasing maturity. For each muscle considered, the rate of change in the contractile and metabolic muscle characteristics differed between beef breeds (e. g. Charolais) compared with non-beef breeds (e. g. dual-purpose or dairy breeds) and also between bulls compared to cows and steers. These differences in muscle development were accounted for by fitting different parameters for each breed and sex group. Assessment of the mean square deviation indicated that parameterisation was logical given the biological responses observed from animal experiments.
Keywords : cattle beef meat enzyme
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Submitted on : Wednesday, June 3, 2020 - 8:59:13 PM
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Nicola Maria Schreurs, Florence Garcia-Launay, Thierry Hoch, Catherine Jurie, Jacques Agabriel, et al.. Dynamic modelling of contractile and metabolic properties of bovine muscle. 7. International Workshop on Modelling Nutrient Digestion and Utilisation in Farm Animals, Sep 2009, Paris, France. ⟨hal-02754690⟩

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