The present disclosure includes methods of improving the quality of poultry and the efficiency of its production. Specifically, single nucleotide polymorphisms (SNPs) have been identified in signature domains and conserved residues found in α-class turkey Glutathione S-Transferase (GSTA) genes. These SNPS correlate with aflatoxin resistance in turkeys. Thus, methods of screening for the relevant SNPs using polynucleotides and anti-peptide antibodies, kits that include these tools, and methods of breeding aflatoxin resistant flocks are provided herein.
