Abstract: The use of a PPAR agonist in the manufacture of a medicament to increase ruminant serum glucose concentrations, and preferably, the use for the palliative, prophylactic or curative treatment of ruminant disease associated with reduced serum glucose concentration. The ruminant disease associated with reduced serum glucose concentration includes fatty liver syndrome, dystocia, immune dysfunction, impaired immune function, toxification, primary ketosis, secondary ketosis, downer cow syndrome, indigestion, inappetence, retained placenta, displaced abomasum, mastitis, (endo-)-metritis, infertility, low fertility, lameness, subacute rumen acidosis and inadequate nutrient intake associated with stress e.g. heat, poor housing, overcrowding, shipping, dominance or illness, and to increase milk quality and yield.