J. Anim Sci.
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J. Anim Sci. 1986. 63:453-456.
© 1986 American Society of Animal Science
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Proportion of Types I and III Collagen in Longissimus Collagen from Bulls and Steers1

D. E. Burson2, M. C. Hunt3, J. A. Unruh4 and M. E. Dikeman

Kansas State Univeristy, Manhattan 66506

Abstract

The proportion of types I and III intramuscular collagen in longissimus muscles of Simmental bulls (n = 8) and steers (n = 8) 17 mo of age was studied. Longissimus samples taken 7 d after slaughter were evaluated for total collagen, types I and HI collagen, heat-soluble collagen, sensory panel traits and Warner-Bratzler shear force. Intramuscular collagen (IMC) was isolated and digested with cyanogen bromide, and peptides were resolved by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Percentage of type III IMC was calculated from the total of types I and III collagen as determined from the peak area of densitometric scans of the cyanogen bromide peptides {alpha}l(I)CB8 and {alpha}l(III)CB8. Longissimus muscles from steers had lower (P<.05) Warner-Bratzler shear values, less (P<.05) sensory panel-detectable connective tissue and more (P<.05) tender panel ratings for muscle fiber tenderness and overall tenderness. Muscles from steers had more (P<.05) heat-soluble collagen than those from bulls, but no differences (P>.05) were found for total collagen and percentage of type III collagen. Some intramuscular-collagen characteristics may have contributed to the less tender muscle of bulls. However, the proportion of types I and III collagen did not account entirely for the tenderness difference between steer and bull muscles. Because there were differences in collagen solubility in muscles from steers and bulls, other collagen characteristics such as crosslinking or fiber size may have been more important than collagen type.

Footnotes

1 Contribution No. 86-99-J, Dept. of Anim. Sci. and Ind., Kansas Agr. Exp. Sta., Manhattan 66506.

2 Present address: Dept. of Anim. Sci., Univ. of Nebraska, Lincoln 68583-0821.

3 Address requests to this author.

4 Present address: Dept. of Anim. Sci., Washington State Univ., Pullman 99164-6230.






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Copyright © 1986 by the American Society of Animal Science.