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Influence of reproductive status on in-vitro renal production of 1,24,25-trihydroxyvitamin D₃ in Japanese quail

Vitamin D₃ is metabolized first in the liver, producing 25-hydroxyvitamin D₃ which is then further hydroxylated at the 1-position in the kidney, producing the hormonal form 1,25-dihydroxyvitamin D₃ (Holick & DeLuca, 1974). Kenny (1976) has demonstrated that when kidney homogenates of Japanese quail were incubated with 25-hydroxyvitamin D₃ birds with a calcified egg in the shell gland produce predominantly 1,25-dihydroxyvitamin D₃, whereas those without an egg produce mainly 24,25-dihydroxyvitamin D₃.