Four-cattle trial tests kratom leaf and yeast as feed supplements

Why it matters

A small feeding experiment reports changes in cattle digestion and rumen function. It leaves growth benefits and residues in edible tissues unresolved, so the findings do not support commercial feeding recommendations or human health claims.

The big picture

Researchers tested kratom leaf powder and brewer’s yeast in four young Thai native beef heifers, with every animal receiving each diet over four 21-day periods. This was a livestock-nutrition experiment using leaf powder, not a study of concentrated 7-OH or human treatment. Several endpoints were estimated from samples rather than measured as whole-animal production outcomes.

Key findings

• Four heifers received a control ration, 10 grams of kratom leaf powder daily, 10 grams of Saccharomyces cerevisiae daily, or 5 grams of each in a four-period Latin-square design.
• The authors report higher apparent crude-protein and acid-detergent-fiber digestibility in supplemented treatments than in controls. Results for other digestibility measures depended on the statistical comparison used.
• Supplemented treatments shifted rumen fermentation toward propionate and increased estimated microbial nitrogen supply. Methane was calculated from fermentation acids, not measured directly as emissions.
• The combination was not shown to outperform either supplement alone. The small, nonfactorial design cannot establish equivalence, synergy or a dose-sparing effect.
• The study did not establish treatment-related growth or feed-conversion benefits and did not measure alkaloid concentrations in the fed batch or residues in meat or milk. Four animals provide limited evidence about longer-term safety.

What they say

The authors recommend longer studies measuring growth, methane directly and tissue residues. They report no external funding and declare no conflicts of interest.

Bottom line

This four-animal trial supports further study of kratom leaf in cattle nutrition, with commercial suitability, food residues and long-term safety still unestablished.