The influence of growth intensity during different age periods on muscle fiber characteristics in pigs
2012
Brzobohaty, L., Czech Univ. of Life Sciences, Prague (Czech Republic) | Stupka, R., Czech Univ. of Life Sciences, Prague (Czech Republic) | Citek, J., Czech Univ. of Life Sciences, Prague (Czech Republic) | Sprysl, M., Czech Univ. of Life Sciences, Prague (Czech Republic) | Okrouhla, M., Czech Univ. of Life Sciences, Prague (Czech Republic) | Vehovsky, K., Czech Univ. of Life Sciences, Prague (Czech Republic)
The aim of the study was to find a period with a significant influence on the ratio of individual muscle fiber types, based on correlation analysis and intensity of pig growth and age. The test was carried out with the use of 72 animals (balanced sex - gilts/barrows) of the Danbred genotype and weight extent of 25-115kg. Pigs were fed ad libitum (according to the body weight) by complete feed mixtures A1, A2, A3. The growth intensity in relation to the muscle fiber characteristics was evaluated, based on the average daily gain (ADG) observed during four different age periods, determined as follows: period A 70-84 days, period B 85-105 days, period C 106-134 days and period D 135-154 days. Following the slaughter the muscle fiber parameters (diameter and perimeter) and typology (the percentage of individual types of muscle fibers - I, IIA and IIB) were determined based on the analysis of samples obtained from the m. longissimus thoracis et lumborum (MLLT). The period A and C showed significant positive correlations (P less than 0.001), where with increasing ADG the proportional share of type I muscle fibers increased, while the share of muscle fiber types IIA and IIB decreased. The period D demonstrated a positive correlation (P less than 0.001) between the change of ADG and proportional share of the slow glycolytic fibers IIB.
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