Effects of Vitamin D and 25-Hydroxyvitamin D Supplementation on Plasma Vitamin D Epimeric Metabolites in Adult Cats.

Feline vitamin D status is based on dietary consumption but metabolism of this essential nutrient and the efficacy of supplementation forms are poorly described in cats. The aim of this study was to further elucidate the metabolites of vitamin D in cats and to compare the effectiveness of vitamin D and 25(OH)D for increasing feline vitamin D status. Eight adult male castrated domestic shorthair cats received vitamin D or 25(OH)D in a single crossover design.