Effect of feeding a high level of sugar in the diet for the last 12 days before slaughter on muscle glycolytic potential and meat quality traits in pigs
1992
Fernandez, X. | Tornberg, E. | Magard, M. | Goransson, L.
The aim of this work was to study the effects of 500 12 kg-1 sucrose diet and of type of food distribution (ad libitum or two meals daily without food restriction) during the last 12 days before slaughter on glycolytic potential (GP, an estimate of resting muscle glycogen content) in pig Longissimus dorsi (LD) muscle, and on meat quality traits in muscles LD and Biceps femoris. The pigs used were three-way crossbred ((Yorkshire X Landrace) X Hampshire). Samples of LD were taken intra vitam, immediately before and after treatment, using a biopsy technique. Muscle metabolites, GP and meat quality traits such as pH, internal light scattering or drip loss did not vary significantly between the treatments. A significant decrease in GP was noted after feeding the conventional diet ad libitum. The lack of effect of the sugar diet on muscle glycogen content might be attributed to the overnight fast (approximately 15 h) preceding the second sampling. It was therefore hypothesised that sugar feeding has no significant long-term effect on muscle glycogen stores. The pigs exhibited a wide individual variability in GP changes during the feeding period. Pigs fed the conventional diet showed a marked trend towards a decreased GP after 12 days. This decrease in GP might be attributed to a sampling date effect, the reasons for which remain unknown.
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