Serum concentration of 25-hydroxyvitamin D in apparently healthy cats regarding age, gender, breed, diet type, reproductive status, and housing condition.

Background: Optimal vitamin D levels for an effective role in immune function and rickets prevention are thought to vary, but have not yet been definitively determined. Reports on reference values of 25-hydroxyvitamin D (25(OH)D) in cats are limited.

Aims: The study provides information about serum 25(OH)D values in cats with different age, gender, breed, diet type, reproductive status, housing condition, and also the relationship between these levels and various hematological and biochemical parameters.