Influence of sire and connective tissue on tenderness of Bos indicus crossbred steers /
The objective of this research was to evaluate the influence of connective tissue on the tenderness of steers produced from different Bos indicus sires. Steers (n = 89) from 10 Bos indicus sires and born from Hereford (n = 15) or Angus (n = 74) cows were slaughtered on one of three days. USDA qual...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1997.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=736823671&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The objective of this research was to evaluate the influence of connective tissue on the tenderness of steers produced from different Bos indicus sires. Steers (n = 89) from 10 Bos indicus sires and born from Hereford (n = 15) or Angus (n = 74) cows were slaughtered on one of three days. USDA quality and yield grade characteristics were obtained. WarnerBratzler shear force (kg) after 1, 7, 14, 21, 28, and 35 d of aging was determined. Insoluble collagen (mg/g), soluble collagen (mg/g), total collagen (mg/g), and collagen solubility (%) also were determined. Samples from progeny of sires displaying notable tenderness differences were selected for evaluation by electron microscopy. offspring from Angus dams had higher (P <.05) marbling scores kidney, pelvic, and heart (KPH) fat and quality grades. Sire affected (P < .05) hot carcass weight, adjusted fat thickness, longissimus muscle area, KPH fat, yield grade, and marbling score; however, overall maturity was not affected (P < .05). Shear force values and total collagen also were influenced (P < .05) by sire. Time of aging affected (P < .05) insoluble collagen, total collagen and collagen solubility, with 1 d samples having the highest insoluble collagen and total collagen, and the lowest collagen solubility. Electron micrographs of selected samples tended to display degradation of the collagen matrix with increased time of aging. Therefore, differences in carcass characteristics and shear force were observed between Bos indicus sires, and differences were seen in collagen characteristics as a result of postmortem aging. In-depth investigation of the collagen matrix of sires displaying notable tenderness differences indicated differences in the degradation of the collagen matrix between offspring of selected sires. |
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| Item Description: | Vita. "Major Subject: Animal Science". |
| Physical Description: | ix, 67 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 41-48. |