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Effects of pre-feedlot growth rate on carcass composition and meat tenderness
| dc.creator | Brigman, Ivan Todd | |
| dc.date.accessioned | 2012-06-07T23:02:54Z | |
| dc.date.available | 2012-06-07T23:02:54Z | |
| dc.date.created | 2001 | |
| dc.date.issued | 2001 | |
| dc.identifier.uri | https://hdl.handle.net/1969.1/ETD-TAMU-2001-THESIS-B753 | |
| dc.description | Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item. | en |
| dc.description | Includes bibliographical references (leaves 62-76). | en |
| dc.description | Issued also on microfiche from Lange Micrographics. | en |
| dc.description.abstract | The effects of pasture growth rate and breed and sex treatments (F₁ Angus x Brahman steers; Simmental-sired calves from F₁ Angus x Brahman or Hereford x Brahman dams) were examined on carcass composition and tenderness. Calves were randomly assigned within breed type and sex to low (3.7 hd/ha), medium (5.1 hd/ha) or high (6.8 hd/ha) stocking rate (SR) pastures. Calves were fed a high-grain diet in a commercial feedlot to an approximate carcass weight of 361 kg. Carcass characteristics were measured 36 h postmortem. Soft tissue from 9-10-11 rib sections was analyzed for fat, protein and moisture content. Longissimus muscle sections were aged for 14 and 35 d and 2.54 cm steaks were removed for Warner-Bratzler (WB) shear force measurement, percent soluble collagen and sensory analysis. Pasture average daily gain (ADG) was affected (P =.0001) by SR (1.14, .77 & .38±.03 kg/d for low, medium & high SR, respectively), and Angus x Brahman steers had higher ADG (P < .001) than Simmental-sired steers and heifers (.86, .77 & .68±.03 kg/d, respectively). Carcass weight was used as a covariate to analyze carcass data. Backfat thickness was (P = .05) lower in low-and medium-SR calves than in high-SR calves (.93, .86, l .03±.06 cm). Quality grades were (P < .001) lower for medium-SR calves compared to high-SR calves (623.74, 653.7±06). Low-SR calves had (P < .001) lower percent soluble collagen (6.34 vs 8.48 and 8.47±.4 %) than did medium or high-SR calves, respectively. Calpastatin activity was affected (P = .0001) by SR (1.69, 2.19, 3.04±.16 activity/g) for low, medium and high SR, respectively. Warner-Bratzler shear force values after 14 and 35 days of aging were not affected by SR. Simmental-sired steers had (P < .001) less backfat (.75 vs 1.08 and .99±.06 cm), and less (P < .001) rib fat (24.23 vs 29.2 and 28.72±.7 %). Angus x Brahman steers compared to Simmental-sired steers and heifers had higher (P < .001) quality grades (665.33 vs 622.12 and 643.14±06 cm). Reducing growth rates by increasing SR did not affect meat tenderness but influenced calpastatin and collagen solubility. | en |
| dc.format.medium | electronic | en |
| dc.format.mimetype | application/pdf | |
| dc.language.iso | en_US | |
| dc.publisher | Texas A&M University | |
| dc.rights | This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. | en |
| dc.subject | animal science. | en |
| dc.subject | Major animal science. | en |
| dc.title | Effects of pre-feedlot growth rate on carcass composition and meat tenderness | en |
| dc.type | Thesis | en |
| thesis.degree.discipline | animal science | en |
| thesis.degree.name | M.S. | en |
| thesis.degree.level | Masters | en |
| dc.type.genre | thesis | en |
| dc.type.material | text | en |
| dc.format.digitalOrigin | reformatted digital | en |
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