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Influence of Breed Type, Sex, Feeding Systems, and Muscle Bundle Size on Bovine Fiber Type Characteristics
Author(s) -
JOHNSTON DAVID M.,
MOODY W. G.,
BOLING J. A.,
BRADLEY N. W.
Publication year - 1981
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1981.tb04480.x
Subject(s) - breed , zoology , biology , longissimus dorsi , muscle fibre , fibre type , longissimus , fiber type , population , fiber , anatomy , biceps , longissimus muscle , chemistry , skeletal muscle , medicine , environmental health , organic chemistry
Fiber type numbers, percentages and diameter were evaluated in two experiments. Experiment 1 contained Angus and Angus cross cattle consisting of 48 steers and 48 heifers with half of each sex fed grain while the other half were fed grain‐on‐grass. Experiment 2 contained 12 Angus and 12 Simmental cross steers slaughtered at four feeding system endpoints. Steers tended to have a higher percentage of βR and a lower percentage of αW fibers than heifers; The percentage of βR fibers increased in the longissimus and semi‐membranosus, while the αW fibers decreased. The percentage of αW fibers in the biceps femoris and semitendinosus muscles increased over the longer feeding period while the percentage βR tended to decrease. Breed appeared to have little effect on histological traits in the longissimus and semimembranosus muscles. Bundle size had no effect on fiber type diameter; however, in all muscles there was a tendency for the βR population to increase as bundle size increased.