Submitted to: Journal of Animal Science Supplement
Publication Type: Abstract Only
Publication Acceptance Date: 2/15/2007
Publication Date: 7/8/2007
Citation: Bosques, J.H., Pagan, M., Casas, E., Casas, A., Cianzio, D. 2007. Evaluation of nucleolar proliferating protein 1 as a candidate gene for beef carcass characteristics [abstract]. Journal of Animal Science. 85(Suppl. 1):18. Abstract #M44.
Technical Abstract: Single nucleotide polymorphisms (SNP) identified in four regions of nucleolar proliferating protein 1 (Nol1: A, B, C and D) were evaluated for associations with carcass traits. Genotyping was performed in a group of 42 bulls (from which breed and age) were assigned to three supplementation treatments (grazing, grazing+wheat middlings, grazing+wheat midlings+corn grain) 60 days prior to harvest. Nol1-A was associated (P < 0.05) with shrinkage percentage (SH), Obliquous muscle weight (OM; kg), trimmed fat (TF; units), and dressing percentage (DP). Animals inheriting the TT and CT genotype had greater SH, OM and DP than those inheriting the CC genotype. Nol1-B was associated (P < 0.05) with SH, left hindquarter weight (LHQ; kg), OM, hindquarter percentage (HQP), frontquarter percentage (FQP), total muscle weight (TMW; kg), and slaughter weight (SW; kg). Animals with the CC and CT genotypes were heavier than those inheriting the TT genotype. Associations (P < 0.05) between Nol1-C and SH, Gastrocnemius muscle weight (GM; kg), TF, LHQ and TMW were detected. Animals having the AA genotype had greater values for SH and GM compared with animals with the AG and GG genotypes. Animals inheriting the GG genotype had greater TF than the other genotypic groups. For Nol1-D, associations where ascertained for HQP, FQP, LHQ, TMW. No animals inherited the AA genotype, but AG animals had greater values for HQP, LHQ and TMW. Although larger studies need to be conducted, results form this study indicate that markers at the nuclear proliferating protein 1 gene are associated with important carcass traits for beef cattle in Puerto Rico.