Characterization and tenderness prediction of a population of two types of predominately brahman, two types of predominately angus, and 1/2 brahman X 1/2 angus /
This research had two primary objectives: to characterize a
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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=736824621&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | This research had two primary objectives: to characterize a population of Angus and Brahman cross calves and to predict tenderness as determined by Warner-Bratzler shear force (SHEAR) and trained sensory panel overall tenderness ratings (OTEND) with carcass and histological traits for this population of calves. The population consisted of steers and heifers (n = 475) from 33 different families that were processed over a 4 yr period. All calves were the product of embryo transfer to generate multiple siblings within each family. Data were analyzed for Family within Breed Type, Breed Type (Angus sire X 1/2 Angus 1/2 Brahman dam; 1/2 Angus 1/2 Brahman sire X Angus dam; Brahman sire X 1/2 Angus 1/2 Brahman dam; 1/2 Angus 1/2 Brahman sire X Brahman dam; 1/2 Angus 1/2 Brahman X 1/2 Angus 1/2 Brahman), Sex, and Kill Group (season and year) effects. Family within Breed Type had a significant effect on most traits analyzed. The variation present between Families within each Breed Type suggests selection should be based on individual genetic lines, not on breeds. Some traits noted a Breed Type effect, but notably absent from that list is marbling score, USDA quality grade, SHEAR and trained sensory panel ratings for muscle fiber tenderness and OTEND. Steers had heavier HCWT, less KPH, less adjusted fat thickness (ADJFAT), and lower YG than heifers. Prediction models for SHEAR and OTEND with carcass and histological traits yielded adjusted R[] of .1854 and .2794, respectively. For prediction of SHEAR, variables FAT, LMA, SARC, and FRAG were used in the model. For prediction of OTEND, variables SARC, LMA, FAT, lean maturity (LEAN), and FRAG were used in the model. With the exception of LMA, these traits all have been shown to be related to tenderness. Prediction of SHEAR and OTEND for the predominately Angus and predominately Brahman calves separately yielded different models. However, simple correlations between SHEAR and OTEND did not differ between predominately Brahman and predominately Angus calves. |
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| Item Description: | Vita. "Major Subject: Animal Science". In title, numerals are used. |
| Physical Description: | xi, 87 leaves ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 80-86. |