day-old chickens with limited vitamin a reserves , the progeny of marginally vitamin a-deficient hens , were fed purified diets containing either marginal ( 120 retinol equivalents/kg diet , ad libitum ) or adequate ( 1200 retinol equivalents/kg diet , ad libitum or pair-fed ) levels of vitamin a for a period of 10 wk .
C0042839
vitamin a
C0042842
vitamin a-deficient