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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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The majority of vitamin A is transported as retinyl esters in the blood of most carnivores.

1. In canines and mustelides total vitamin A was 10-50 times higher compared to other species due to a high amount of retinyl esters (40-99% of total vitamin A) in blood plasma. The dominant vitamin A ester was in most species retinyl stearate. 2. In Ursidae, Procyonidae, Viveridae and Felidae, total vitamin A was much lower. When present, however, retinyl esters also represented 10-65% of total vitamin A in plasma. 3. Only retinol was detected in plasma of the family, Hyaenidae, and the suborder, Pinnipedia. 4. In maned wolf cubs it was found that retinol, retinyl esters and alpha-tocopherol increased with the age of the animals, reaching values comparable to adult animals at the age of 5 months.[1]

References

  1. The majority of vitamin A is transported as retinyl esters in the blood of most carnivores. Schweigert, F.J., Ryder, O.A., Rambeck, W.A., Zucker, H. Comparative biochemistry and physiology. A, Comparative physiology. (1990) [Pubmed]
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