Abstract
SUMMARYFibre number and fibre size were measured in theflexor digiti V brevismuscle and other muscles in pigs of different breeds. A large variation in fibre number (200%) was found among the breeds. However, the fibre number in theflexor digiti V breviswas closely correlated with fibre number of other muscles in the same animal. Fibre number and size measurements were also carried out on animals at different ages taken from a relatively pure breed of pig. Fibre size was found to increase to differing extents in different muscles, although the increase in theflexor digiti V breviswas almost the same as in thelongissimus dorsi. Fibre number did not change during growth. On the basis of these findings it is suggested that theflexor digiti V brevisis a suitable indicator muscle for genetic experiments.
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