Moderators: Essie73, ynskek, Ladybird, Polly, Muiz, Telpeva, NadjaNadja
Citaat:The maximum tolerated dose for hypoglycin A fed to rats in ackee seeds is 1.5 mg/kg bwt/day [33]. Conversion of this dose to the horse using body surface area and the equation 1.5 mg/kg bwt x 500 0.75/6 (rat km value) yields a maximum tolerated dose of 26.5 mg/horse. This would correspond to as few as 165 seeds at the highest concentration of hypoglycin/seed (160 mg/seed) and over 8000 at the lowest concentration.
The maximal fecundity for box elders has been estimated at 5 ¥ 105 samaras per tree per year [34]; thus horses on pastures could easily consume more than this maximum tolerated daily dose. These numbers are highly speculative, as it is very possible that horses succumb to hypoglycin A toxicity at levels very different from the rat. Further studies are needed to determine the lethal dose of hypoglycin A and factors that affect the highly variable hypoglycin A seed concentrations, including effects of seed maturity, temperature fluctuations, rainfall, sunlight and more [34,35]. Hypoglycin A concentrations were not measured in box elder seeds from the control farms because sample collection occurred in
May when seeds were immature.