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Thermal Shrinkage Temperature of Intramuscular Collagen of Bulls and Steers^1,2,

Purdue Agricultural Experiment Station^,3, West Lafayette, IN 47907 and US Department of Agriculture^,4, Clay Center, NE 68933

Abstract

The thermal shrinkage temperature (T_s) of bull muscle collagen was higher (P<.01) than that of steers when averaged over three slaughter ages of 12, 15 and 18 mo. Collagen T_s from bull muscles increased from 12 to 15 mo and decreased from 15 to 18 mo of age, whereas that of steer muscles did not change with age (age x sex interaction, P<.01). No breed effects (7/8 Charolais, 7/8 Simmental, Angus and Hereford) were detected nor were there breed x sex or breed x age interaction effects on collagen T_s. Carcass electrical stimulation did not affect collagen T_s in steer muscle, but there was a trend toward reduction of T_s in collagen of bull muscle.

¹ Journal Paper No. 9745 of the Purdue Agr. Exp. Sta., Dept. of Anim. Sci.

² The technical assistance of Anna Maria Bracker and Alison McCartney is gratefully acknowledged.

³ Sept. of Anim. Sci.

⁴ ARS, SE, Roman L. Hruska U.S. Meat Animal Research Center, P.O. Box 166, Clay Center.

⁵ Present address: Dept. of Anim. Sci., Texas A&M Univ., College Station, TX 77843.