I am currently conducting a QTL analysis using R, and I have successfully identified a set of significant QTL intervals based on a LOD drop criterion of 1.5, utilizing the 'lodint' function. To further investigate these QTLs, I possess a KASP annotation file containing genetic material information. Could anyone kindly provide guidance on how to effectively employ this KASP annotation file within R to discern the specific genetic material present within these intervals, thereby aiding in the understanding of the genetic basis underlying the observed QTLs for the relevant trait?