Fig. 1From: Analysis of polygenic selection in purebred and crossbred pig genomes using generation proxy selection mappingDistribution of AGE for all genotyped pigs. For each pig, AGE was calculated as the number of months between each pig’s birth month and January 2006. A pig with a negative, zero, or positive AGE was born before January 2006, during January 2006, or after January 2006, respectivelyBack to article page