FIGURE 1.

Liver VA (A) and serum retinol (B) concentrations in gerbils after consuming feeds with different combinations of provitamin A carotenoid and preformed VA sources. All values are means ± SDs (n = 5–7). Liver VA residuals were not normally distributed, and variance was not homogeneous; data were analyzed nonparametrically. Horizontal lines at 0.1 μmol/g (A) and 0.7 μmol/L (B) are the deficiency cutoff concentrations. Labeled means without a common letter differ, P < 0.05. B, baseline; O, orange; VA, vitamin A; W, white.