it is because of excess nitrogen in the grass which gets converted into urea in the liver so it can be excreted in the urine.

Consecutive days of cool, cloudy, rainy weather keeps grass green and favours clover growth. When interspersed with HOT sunny days this creates high risk conditions for all equines especially those prone to laminitis and other issues caused by such grass.

There is a BIG difference between a horse whose nervous system is disturbed by the mineral/nutrient imbalances in Spring (or Autumn) grass and one that merely has excess energy from 'sugars'.

Glyphosate - Concerns about Glyphosate residues in beet are completely unfounded

Cape-weed, especially when it has been mowed, can cause ‘neurological’ issues in horses. Sometimes signs are only mild as in being spooky but occasionally they are far more serious

Horses that are ‘down’ on their nutrition tend to be affected more often and more seriously. Especially when it rains after a dry spell and the grass greens up! Well mineralized horses are more resilient and tend to be less affected.

When rehabbing horses and ponies from laminitis, head-shaking and many other issues we categorize as ‘grass-affected’, these new ‘green shoots’ can cause a relapse.

‘Pinking’ of the white line is a Red Flag because it means that blood supply to the laminae has been compromised, even if it was temporary.