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Evaluation of carcass traits, connective tissue, and myofibrillar protein characteristics on tenderness of F1 steers sired by Bos indicus bulls
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Steers (n = 252) from 15 Brahman sires and 1 Nellore sire and born from Hereford (n = 44) or Angus (n = 208) cows were evaluated over five years for difference in tenderness. Sixty purebred Angus steers were included in the last three years. The cattle were commercially slaughtered and quality and yield grade characteristics were obtained. Warner-Bratzler shear force values (kg) were obtained after 1, 7, 14, 21, 28, and 35 d of aging at 4°C. Sarcomere length (m), 24 h calpastatin activity (activity/g), fat (%), moisture (%), total collagen (mg/g), and collagen solubility (%) also were determined. Sire influenced (P < .05) adjusted preliminary yield grade (PYG), hot carcass weight, ribeye area, kidney, pelvic, and heart (KPH) fat, yield grade, lean maturity, overall maturity, marbling, and quality grade. Sire affected (P < .05) shear force values for aging periods 1, 7, and 21 d postmortem aging. Sire influenced (P < .05) percentage fat and collagen solubility, but sire did not affect sarcomere length, calpastatin activity, percent moisture, or amount of total collagen. Purebred Angus steers were included in the last three years of this study. The F₁ steers were less tender at 1 d and 7 d postmortem than Angus steers. Angus steers reached their maximum tenderness after 7 d postmortem. However, F₁ steers showed a faster rate of aging and were not different in tenderness after 14 d postmortem aging than meat from Angus steers. Angus and F₁ steers also were compared using only the data from the last three years. Angus steers had younger lean maturity, higher adjusted PYG, higher skeletal maturity, higher marbling scores, and high quality grades than (P < .05) than F₁ steers. Sarcomere length, percent moisture, and percent fat differed between breeds, however calpastatin activity did not. As in the overall analysis, shear force values for Angus steers showed an improvement after 7 d postmortem aging and did not differ with longer aging period. The F₁ steers did not reach their maximum tenderness until 21 d postmortem aging; however, the rate of aging was faster for F₁ steers than the Angus steers, and shear force values did not differ between the two breeds after 21 d aging.
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Includes bibliographical references (leaves 64-72).
Issued also on microfiche from Lange Micrographics.
Hager, Leslie Brooke (2000). Evaluation of carcass traits, connective tissue, and myofibrillar protein characteristics on tenderness of F1 steers sired by Bos indicus bulls. Master's thesis, Texas A&M University. Available electronically from
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