Detection of prohibited animal products in livestock feeds by single-strand conformation polymorphism analysis.

This study uses single-strand conformation polymorphism (SSCP) analysis to detect prohibited animal products in livestock feed. It identified and distinguished between permitted and prohibited animal products in North American livestock feed.

Methodology

• The researchers work with SSCP, a technique used to detect variations or polymorphisms in DNA strands. This method was used to analyze amplicons, sections of DNA resulting from amplification in polymerase chain reactions, derived from a specific region of mitochondrial DNA situated between two genes: tRNA(Lys) and ATPase8.
• The intent of employing the SSCP method was to detect animal products (derived from different species) within livestock feed. The distinction between prohibited (cattle, elk, sheep, deer, and goat) and nonprohibited (pig and horse) animal products was made feasible due to the different display patterns that DNA fragments, specific to varying animal species, exhibit on SSCP gels.

Findings

• The SSCP analysis method proved reliable in the specific detection and identification of mixed genomic DNA traced to distinct animal species within livestock feed. This is significant as different animal species have varied and specific DNA patterns that can be analyzed using this technique.
• The study could trace small amounts of cattle-derived materials present in pig meat and bone meal. Even grain-based feeds fortified with varying proportions (0%, 1%, 5%, and 10%) of porcine (pig-derived) meat and bone meal showed the presence of cattle-derived materials.

Implications

• This study, by demonstrating the effectiveness of SSCP analysis for the detection and differentiation of animal products in feed, has presented a reliable scientific method for the quick identification of prohibited components in livestock feed.
• From a regulatory standpoint, this can lead to more stringent monitoring of feed-grade materials and a reduction in the introduction of prohibited contents into the livestock feed supply chain. The ability to detect even trace amounts of prohibited materials fortifies this system against health risks potentially introduced through feeding activities.
• Further exploration and refinement of this method could potentially make it an industry-standard tool for livestock feed quality control.