During the last century, intensive selection on flowering time has allowed the cultivation of this originally tropical plant in higher latitudes.
For SNPs in the IGF2-region, these low MAF are the result of intensive selection on that genomic region, whereas for the predicted candidate SNPs we did not know what to expect because of the unknown genomic location of these SNPs.
The modern commercial broiler is the product of intensive selection for rapid growth and enhanced muscle mass over many generations.
Generally it is believed that the breed formation may be a very late activity with a low time depth vis-à-vis the process of domestication of a particular livestock species [ 11] and the breed differentiation may be the result of an intensive selection mainly operating through the paternal lineages.
The increased incidence of irregular luteal phases found in dairy cattle are believed to be the result of intensive selection and management to produce high milk yields [ 8, 10, 27].
Thus, it is not surprising that such a critical function has been the subject of intensive selection through evolutionary history, and a wide variety of sound production mechanisms have evolved in different animals.
Together, these observations indicated that the impact of intensive selection by modern soybean breeding on reduction of genetic diversity was less severe than that of selection by the domestication process, suggesting that the wild soybean gene pool was the major reservoir that retained genes/alleles lost during domestication and modern breeding practice.
This is based on the observation that intensive selection for variants ultimately leads to a complete loss of variation within the chromosomal region that surrounds the selected variant and results in the complete fixation of the haplotype that harbours the selected variant [ 13].
Since the mid-1960's, using intensive selection, artificial insemination and, more recently, embryo implantation, breeders and animal scientists have succeeded in doubling milk production in Holsteins, the world's top-producing dairy cow, said Dr. Les Hansen, professor of animal science at the University of Minnesota.
The crop has undergone intensive selection in China and there are about 26 cultivars grown commercially.
