Determination of mammalian deoxyribonucleic acid (DNA) in commercial vegetarian and vegan diets for dogs and cats.
Authors: Kanakubo K, Fascetti A J, Larsen J A
Journal: Journal of animal physiology and animal nutrition
Summary
# Editorial Summary: Hidden Meat in Plant-Based Pet Foods Quality control failures in the pet food industry extend to vegetarian and vegan formulations, with Kanakubo and colleagues using multiplex PCR to screen 14 commercial diets marketed as meat-free and detecting mammalian DNA in half of them. By amplifying species-specific mitochondrial sequences from the cytochrome b gene, the researchers identified bovine, porcine and ovine DNA across seven products, with results reproducible in six diets when resampled 3–4 months later—suggesting systematic rather than occasional contamination. Whilst most positive samples contained the same undeclared DNA at both time points, some showed inconsistent results, indicating that unintentional cross-contact during manufacturing or shared facility use may explain certain findings rather than deliberate adulteration. The practical implications remain nuanced: the presence of mammalian DNA cannot confirm intentional fraud, nor does it establish whether trace contamination poses clinical risk to dogs and cats that owners have specifically chosen plant-based diets for health, ethical or allergy-related reasons. Equine professionals advising clients on supplementation sourcing and feed mill standards should recognise this study as evidence supporting rigorous supplier verification and batch testing, particularly where ingredient declarations carry specific dietary or medical significance.
Read the full abstract on PubMed
Practical Takeaways
- •Quality control concerns exist for commercial vegetarian/vegan pet diets, with over half potentially containing undeclared mammalian ingredients
- •Cross-contact with animal-sourced ingredients during manufacturing may be responsible for some contamination, suggesting improved separation of production lines is needed
- •Pet owners selecting vegetarian/vegan diets should be aware that products may not meet their ingredient claims despite marketing
Key Findings
- •50% of vegetarian/vegan pet diets (7/14) tested positive for undeclared mammalian DNA from bovine, porcine, or ovine sources
- •Results were repeatable for one or more species in 6 diets, suggesting consistent contamination
- •Most detected DNA was present at both sampling timepoints 3-4 months apart, indicating potential manufacturing issues rather than isolated events
- •No feline, cervine, canine, caprine, equine, murine, or leporine DNA was identified in any samples