J. Anim Sci.
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J. Anim Sci. 1980. 51:340-343.
© 1980 American Society of Animal Science
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Comparison of Muscle Fiber Types from 2-Year-Old Fillies of the Belgian, Standardbred, Thoroughbred, Quarter Horse and Welsh Breeds

C. L. Stull1 and W. W. Albert2

University of Illinois, Urbana 61801

Abstract

The percentages of three muscle fiber types in the biceps femoris and triceps brachii were determined in five breeds of horses: Belgians, Standardbreds, Thoroughbreds, Quarter Horses and Welsh ponies. Biopsies were taken from the two muscles from each of four 2-year-old untrained fillies of each breed. Percentages of red, white and intermediate fiber types were determined from tissues stained for succinic dehydrogenase activity. Intermediate fibers were the most numerous for all breeds. The difference between red and white fibers varied significantly with breed. Thoroughbreds had the highest percentage of red fibers and Belgians had the most white fibers.

Footnotes

1 Current address: 106 Stock Pavilion, Urbana, IL 61801.

2 Current address: 104 Stock Pavilion, Urbana, IL 61801.






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Copyright © 1980 by the American Society of Animal Science.