Submitted to: Animal Genetics International Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: April 1, 2002
Publication Date: August 11, 2002
Citation: CASAS, E., KEELE, J.W., SHACKELFORD, S.D., STONE, R.T. QUANTITATIVE TRAIT LOCI FOR BIRTH WEIGHT, LONGISSIMUS MUSCLE AREA, AND MARBLING ON BOVINE CHROMOSOME 5. ANIMAL GENETICS INTERNATIONAL CONFERENCE PROCEEDINGS. Gottingen, Germany. 2002. P. 163. Abstract No. E010. Technical Abstract: A study to detect quantitative trait loci (QTL) on bovine chromosome 5 (BTA5) affecting growth, carcass composition and meat quality traits was pursued. Thirteen microsatellite markers were genotyped on 547 progeny from a Brahman X Hereford sire mated to mostly composite (MARC III) dams. Traits analyzed were birth weight (kg), marbling, and longissimus muscle area (cm**2). Significant QTL were detected when the expected number of false positives (ENFP) was less than .05 (F-statistic greater than 16.6), and suggestive when the ENFP was less than 1 (F-statistic between 10.0 and 16.59). The effect of the QTL on the traits was measured in standard deviation units (SD). Significant QTL were detected for birth weight (ENFP= .0007) at 57 cM from the beginning of the linkage map, and for longissimus muscle area (ENFP= .049), at cM 53. Suggestive evidence for the presence of a QTL for marbling (ENFP= .2) was detected at cM 75. The effect of the QTL were 0.5 SD, 0.4 SD, and 0.36 SD, for birth weight, longissimus muscle area, and marbling, respectively. Before implementing marker-assisted selection programs, the effect of the QTL on BTA5 needs to be estimated in additional target populations.