In My Opinion…     
8 Levels of Concern for Chemical Contamination by Agricultural Weed Killers on Hay for Horses...
by Ross Buchanan

The level of Chemical Contamination by Glyphosate the Active Ingredient, but not the only damaging ingredient, in the most common Agricultural Weed Killers is increasingly of concern to Horse Health. My personal belief is that what is of special importance to horses are how the Antibiotic Glyphosate effects the microbial activity and health of the Digestive System, how Glyphosate as a Chelating Agent binds with, ties up and blocks the bioavailability of minerals leading to compromised Immune Systems among other things and how Glyphosate mimics and could potentially displace Glycine in the creation of proteins possibly resulting in the compromised integrity of collagen. A and L Canada Laboratories in London Ontario offers testing for Glyphosate using the powerful and precise LS/MS/MS technology. My understanding is that the cost to test hay samples for Glyphosate is in the range of $300 per sample.

Level 8… “Yellow” Hay. Chemically desiccated and then cut prior to reseeding. Not yellow. Looks like regular hay. (Scary!)

Level 7…Roundup Ready Alfalfa (up to 1000 ppb)

Level 6…Hay Fields fertilized with manure containing Glyphosate Residue typically from Soy or Corn based Livestock Feed. (100 to 1000 ppb)

Level 5…Soil Chemically Burned prior to planting (10 to 100 ppb)

Level 4…Overspray (very wide range depending on magnitude of overspray…could exceed 1000 ppb)

Level 3…Chemical Drift (typically under 100 ppb)

Level 2…Regional Atmospheric Contamination (hopefully under 10 ppb)

Level 1…Clean, Safe, Nutritious Hay for Horses (0 ppb)

Having immersed myself in the study and investigation of the unintended biological consequences of Chemical Weed Killers on Horses it is my belief that there is no such thing as a “safe” level of chemical residue in hay for horses.