2013 Volume 56 Issue 2 Pages 159-165
Selection responses by deterministic simulation were compared among selection models which had different source of information: SCD (stearoyl-CoA desaturase) genotypes, phenotypic values of an individual and relatives. Selection response per a generation or a year was computed with a framework of selection index. A target trait of the simulated selection was oleic acid (C18:1) percentage of longissimus thoracis muscle of beef cattle, and genetic parameters of the trait was taken from literatures. The highest selection response was obtained in a combined selection model of phenotypes of half sib and progeny. The other phenotypic selection models also showed higher selection responses than selection models with gene information. A combined selection model with phenotypes and genotypes of parents and half sibs of them showed higher selection response than the other selection models with gene information. Whereas, in terms of selection response per a year, the combined selection model with phenotypes of half sib and progeny showed lower ranking among the selection models due to longer generation interval. The selection model with phenotypes and genotypes of parents and half sibs of them showed the highest selection response among the selection models because it had shorter generation interval. Due to moderate heritability of the oleic acid percentage, phenotypic selection models had higher selection response per a generation, however, the advantage diminished due to longer generation interval. Thus the advantage of a selection model with gene information seems to be realized when it has modest selection response and shorter generation interval.