Retinoic acid concentrations in plasma for all treatments in the present study were slightly lower than the 250 ng/mL threshold but liver retinoic acid concentrations for all treatments were well above the 2000 ng/g threshold. Knight, Death, Muir, Ridland, and Wyeth (1996) fed 0, 100,000 or 250,000 IU/day of VA as retinyl acetate, and reported
that in VA supplemented heifers, plasma and liver carotenoid content decreased significantly by day 10 and remained lower throughout the study. However, Knight et al. (1996) also observed an increase in liver retinol concentration and no difference in plasma retinol concentration when comparing un-supplemented animals to supplemented animals.
Retinoic acid concentrations in plasma for all treatments in the present study were slightly lower than the 250 ng/mL threshold but liver retinoic acid concentrations for all treatments were well above the 2000 ng/g threshold. Knight, Death, Muir, Ridland, and Wyeth (1996) fed 0, 100,000 or 250,000 IU/day of VA as retinyl acetate, and reportedthat in VA supplemented heifers, plasma and liver carotenoid content decreased significantly by day 10 and remained lower throughout the study. However, Knight et al. (1996) also observed an increase in liver retinol concentration and no difference in plasma retinol concentration when comparing un-supplemented animals to supplemented animals.
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