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Abstract
The aim of the experiment was to determine the effect of different strategies of pig nutrition (restriction and realimentation) on histochemical traits in Longissimus lumborum (LL), Biceps femoris (BF) and Semitendinosus (ST) muscles. Reduced energy and protein intake contributed to a significant decrease in the weight of LL muscles during controlled growth and in the weight of LL, BF and ST muscles at 168 days of age. After the restricted feeding period, it was found that reduced intake of protein and energy or of protein alone had a significant effect on the proportion and diameter of fast-twitch glycolytic (FTG) fibres. After realimentation, no differences in muscle structure were found between the investigated groups of animals. Regardless of the feeding system, the growth of pigs was paralleled by hypertrophy of all muscle fibre types and their different transformation in the muscles.