another name for azoturia,
monday morning disease (or simply "monday disease") is so named because it often occurred in
work horses after the weekend. horses were traditionally not worked on
sunday, but were often fed the same amount of grain as on other days of the week. when monday rolled around, farmers wondered why their horses were suddenly cramping up out on the
field.
you might as well see azoturia for more information. i'd feel bad if i didn't make the main writeup under its scientific name.