Heterogeneity of distribution for carcass traits between angus and brahman backcross embryo transfer cattle /
This experiment involved 3/4 Angus 1/4 Brahman and 3/4 Brahman 1/4
| Main Author: | |
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[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=736824661&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | This experiment involved 3/4 Angus 1/4 Brahman and 3/4 Brahman 1/4 Angus bovine families that were created by backcross matings utilizing embryo transfer. A total of 419 animals were used in the carcass trait analysis. The individual parents in this study were selected to represent a wide range of phenotypic diversities. The carcass traits analyzed included hot carcass weight (HCWT), dressing percent (DP), actual fat thickness (AFAT), rib eye area (REA), yield grade (YG), kidney, pelvic, and heart fat percent (KPH), marbling score (MARB), quality grade (QUAL), and Warner-Bratzler shear force (WBS). Analysis of variance was completed to determine differences that existed between calf code, family code, sex, and slaughter group. Additionally, data was sorted for calf code and suggested optimum standards for each trait and analyzed for differences in class distribution by Chi-Square Tests. Analysis of variance indicated that calf code and family code nested within calf code were significant (P < .05) for all traits. Sex was a significant effect for HCWT, AFAT, and YG. Significant differences (P < .0001) were found for HCWT steers, AFAT, KPH, and REA. Additionally, Chi-Square indicated significant differences existed in the distribution of both marbling score and quality grade. 3/4 Brahman cattle produced carcasses with smaller marbling scores than 3/4 Angus cattle. Quality grade distributions were from Standard to Choice in the 3/4 Brahman cattle and Select to Prime in the 3/4 Angus cattle. This resulted in 12% of the 3/4 Brahman cattle producing carcasses unacceptable in quality grade. Warner-Bratzler shear force was placed in four classes. Chi-Square indicated no significant differences in classes less than 4.55 kg and highly significant differences (P < .005) in the > 4.55 kg class. These data showed that 22.7% of the 3/4 Brahman cattle were in this class compared to 9.4 % of the 3/4 Angus carcasses. Therefore, it should be noted that acceptable carcasses are produced by both calf types. It should be noted that cattle producers should identify those acceptable genetics of both types for successful management and increased consumer acceptance. |
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| Item Description: | Vita. "Major Subject: Animal Science". |
| Physical Description: | xii, 73 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 69-72. |