Within the framework of this diploma, a genotypization of 162 beef cattle of the ČESTR commercial breed from was performed in order to analyze the potential influence of gene coding calpain I (CAPNI) on the resulting beef tenderness. CAPN1 present on the BTA29 chromosome, was selected in previous studies as a candidate gen for QTL. Polymorphism of CAPNI gene was studied using PCR/RFLP method and CAPN530 marker. Genotype identification resulted from this procedure. A 341 bp long fragment was present in homozygotes AA, two fragments of 195 and 146 bp were present in homozygotes GG, and three fragments of 341, 195 and 146 bp were detected in heterozygotes AG. The genotypization output was subsequently statistically evaluated. 11 homozygotes AA, 62 homozygotes GG and 89 heterozygotes AG were detected in the analyzed beef cattle population. More frequent G allele occurred in the set with the frequency of 0,657 and A allele with the frequency of 0,343. Warner-Bratzler shear test was employed to determine beef tenderness based on the shear force attribute. Samples of raw and grilled beef aging 1, 14 and 28 days after the slaughter were analyzed. Statistical methods were used to evaluate relationship between genotype and detected amount of shear force. In case of raw beef, only the samples aging 1 day after the slaughter showed significant difference in the shear force. The most positive results for the given parameter were achieved in case of AG genotype. Samples aging 14 and 28 days after the slaughter showed no difference in shear force and related beef tenderness, indicating no genotype influence. In case of grilled beef, no significant difference in sheer force indicating possible genotype influence was detected at any day of analysis. Genotype influence on grilled beef tenderness within the test animal population is minimal and statistically inconclusive.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:137050 |
| Date | January 2012 |
| Creators | VERNEROVÁ, Kateřina |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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