The number of muscle fibers at birth appears to determine the maximal lean meat growth capacity in pigs and in cattle. Development of muscle fibers is regulated by the MyoD gene family consisting of MyoD1, myf-5, myf-6, and myogenin. Myf-5 is expressed in proliferating myoblasts. Here we report the genomic sequence of the porcine myf-5 gene with three microsatellites and two RFLPs located close to the coding sequences. Two of the microsatellites are located in the promoter region. The allelic distribution differs between breeds and selection lines. In two GY selection lines, 1216 pigs of two-generation families were genotyped for the HinfI RFLP, which was segregating in the GY breed. The other polymorphic loci are physically linked to this RFLP locus, and therefore the results can be extrapolated to these loci. Statistical analysis revealed no association with birth weight, growth rate, weight at slaughter age, carcass meat weight, and backfat thickness. Thus, in this study myf-5 did not explain genetic variation in meat (muscle) development in pigs.
Mammalian Genome – Springer Journals
Published: Feb 1, 1999
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