SciELO - Scientific Electronic Library Online

 
vol.39 número1Dinámica poblacional en rebaños que participan en el programa de erradicación de la brucelosis bovina en la Décima Región de ChileFenotipo atípico de Vibrio ordalii, bacteria altamente patogénica aislada desde salmón del Atlántico cultivado en las costas marinas del sur de Chile índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Archivos de medicina veterinaria

versión impresa ISSN 0301-732X

Resumen

MUNOZ, A; CASTEJON, F M  y  AGUERA, E I. Differences in muscle enzyme profile and metabolic response to fighting in bulls from one to three years old. Arch. med. vet. [online]. 2007, vol.39, n.1, pp. 35-41. ISSN 0301-732X.  http://dx.doi.org/10.4067/S0301-732X2007000100005.

The metabolic response to exercise is partially linked to muscle enzyme profile, and both factors might be influenced by ageing. This research aims: 1) To analyze the differences in muscle characteristics of fighting bulls of different ages; and 2) To assess whether the muscle enzyme profile is affected by ageing in the same way it affects other bovine breeds. Muscle biopsies from gluteus medius and semitendinosus muscles were withdrawn immediately after bullfighting, at depths of 3 and 5 cm, from a total of 24 animals, belonging to three age groups: A (1-year-olds; n=6), B (2-year-olds; n=6) and C (3-year-olds; n=12). Muscle concentrations of glycogen, lactate, adenosin triphosphate and glucose-6-P were determined. In addition, activities of citrate synthase, 3-OH-acyl-dehydrogenase, glycogen phosphorylase, lactate dehydrogenase and hexokinase were measured. No significant differences were found between the two analyzed muscles and neither between depths for any of the muscle parameters. Group A showed lower muscle lactate accumulation, with positive correlations between oxidative and glycolytic enzymes, reflecting a balance between both metabolic pathways. Group B was the most oxidative, whereas group C was the most glycolytic. Therefore, muscle oxidative potential achieved its maximum at 2 years of age, whereas the glycolytic capacity increased progressively with ageing. These results are different from those showed by other bovine breeds, with a progressive reduction in oxidative potential from birth. In conclusion, age significantly influences metabolic response to fighting as well as muscle enzyme profile in bulls.

Palabras clave : bovine; exercise; muscle; metabolism.

        · resumen en Español     · texto en Español     · pdf en Español