Master of Science (MS)
Animal Science (Animal, Dairy, and Poultry Sciences)
The objective of this study is to evaluate the association of single nucleotide polymorphisms with growth, performance, and carcass quality and composition characteristics in a population of cattle consisting of multigenerational Angus sired calves and modern characteristic Charolais sired calves. A total of 132 calves were evaluated. Due to a limited sample population statistical difference was set at p ˂ 0.05 and statistical trends were set at p ˂ 0.1. Mean birth weights were significantly higher for Charolais sired calves as compared to Angus sired calves. Significant differences were observed between the two breed types for mean weaning weights with Angus sired calves having heavier weaning weights as compared to Charolais sired calves. Charolais sired animals had significantly larger rib eye areas as compared to the Angus sired animals. A significant difference was observed between the two groups for back fat thickness with the Angus sired animals having a larger amount than the Charolais sired animals. Angus sired animals had significantly higher marbling scores as compared to the Charolais sired animals. Eleven SNP on CAPN3 and two SNP on CAST were found to be associated with at least one of the traits observed. Two of these SNP were significantly associated with weaning weight. Three of these SNP were significantly associated with hip height. One SNP was significantly associated with average daily gain. Three of these SNP were significantly associated with hot carcass weight. One of the SNP was significantly associated with marbling score. One was significantly associated with rib eye area and two of these SNP were significantly associated with back fat thickness.
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Bailey, Jennifer Lynn, "A genomic and quantitative evaluation of modern Charolais sired calves versus multigenerational Angus sired calves for growth and carcass quality and compostion traits" (2013). LSU Master's Theses. 3774.
Garcia, Matthew D.