In this STtalks we learn more about the genetics behind heat-tolerant cattle by diving into the slick gene. The group outlines how slick was introduced into the Holstein breed, and why heat tolerance matters for productivity in tropical and heat-stress regions. They also cover potential benefits for Beef on Dairy calves, recent progress in building higher-merit slick sire lines, and practical implementation using genomic testing, STrategy™, and Chromosomal Mating® to track and increase slick frequency over time.