title: Assessment of single nucleotide polymorphisms in genes residing on chromosomes 14 and 29 for association with carcass composition traits in Bos indicus cattle.
abstract: Objective of this study was to assess the association of SNP in the diacylglycerol O-acyltransferase 1 (DGAT1), thyroglobulin (TG), and micromolar calcium-activated neutral protease (CAPN1) genes with carcass composition and meat quality traits in Bos indicus cattle. A population of Brahman calves (n = 479) was developed in central Florida from 1996 to 2000. Traits analyzed were ADG, hip height, slaughter weight, fat thickness, HCW, marbling score, LM area, estimated KPH fat, yield grade, retail yield, sensory panel tenderness score, carcass hump height, and cooked meat tenderness measured as Warner-Bratzler shear force at 7, 14, and 21 d postmortem. Single nucleotide polymorphisms previously reported in the TG and DGAT1 genes were used as markers on chromosome 14. Two previously reported and two new SNP in the CAPN1 gene were used as markers on chromosome 29. One SNP in CAPN1 was uninformative, and another one was associated with tenderness score (P < 0.05), suggesting the presence of variation affecting meat tenderness. All three informative SNP at the CAPN1 gene were associated with hump height (P < 0.02). The TG marker was associated with fat thickness and LMA (P < 0.05), but not with marbling score. No significant associations of the SNP in the DGAT1 gene were observed for any trait. Allele frequencies of the SNP in TG and CAPN1 were different in this Brahman population than in reported allele frequencies in Bos taurus populations. The results suggest that the use of molecular marker information developed in Bos taurus populations to Bos indicus populations may require development of appropriate additional markers.
authors.affiliation: ARS, USDA, U.S. Meat Animal Research Center, Clay Center, NE 68933, USA. casas@email.marc.usda.gov <casas@email.marc.usda.gov>
authors.forename: E
authors.initials: E
authors.lastname: Casas
authors.forename: S N
authors.initials: SN
authors.lastname: White
authors.forename: D G
authors.initials: DG
authors.lastname: Riley
authors.forename: T P L
authors.initials: TP
authors.lastname: Smith
authors.forename: R A
authors.initials: RA
authors.lastname: Brenneman
authors.forename: T A
authors.initials: TA
authors.lastname: Olson
authors.forename: D D
authors.initials: DD
authors.lastname: Johnson
authors.forename: S W
authors.initials: SW
authors.lastname: Coleman
authors.forename: G L
authors.initials: GL
authors.lastname: Bennett
authors.forename: C C
authors.initials: CC
authors.lastname: Chase
mesh_terms: D000818:Animals; D001823:Body Composition / Q000235:genetics* / Q000502:physiology; D002154:Calpain / Q000235:genetics; D002417:Cattle / Q000235:genetics* / Q000502:physiology; D033481:Chromosomes, Mammalian / Q000235:genetics*; D017931:DNA Primers / Q000737:chemistry; D051048:Diacylglycerol O-Acyltransferase / Q000235:genetics; D005260:Female; D005787:Gene Frequency; D005819:Genetic Markers / Q000235:genetics; D005838:Genotype; D008297:Male; D008460:Meat / Q000592:standards*; D008957:Models, Genetic; D010641:Phenotype; D016133:Polymerase Chain Reaction / Q000662:veterinary; D020641:Polymorphism, Single Nucleotide / Q000235:genetics / Q000502:physiology*; D013954:Thyroglobulin / Q000235:genetics
chemical_list: D017931:DNA Primers; D005819:Genetic Markers; D013954:Thyroglobulin; D051048:Diacylglycerol O-Acyltransferase; D002154:Calpain