Precedence for the importance of polymorphisms in the 5′UTR gene region include SNP within this region of the bovine growth hormone receptor gene, which has a marked effect on beef production traits [34], and the association of a SNP within the 5′UTR of the bovine lactoferrin (LF) gene with reproductive parameters and uterine infection in dairy cattle [35]. This evidence concerns the gene LTF and endometritis.