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Vitamin Tolerance of Animals (1987) / Chapter Skim
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5 Ascorbic Acid
Pages 36-42

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From page 36...
... It is synthesized in all animal species studied with the exception of humans, several primates, the Indian fruit bat, the guinea pig, a few birds, fish, and invertebrates (Burns, 1957; Ray Chauduri and Chatterjee, 1969; Chatterjee et al., 1975~. Therefore, ascorbic acid is not considered to be an essential dietary nutrient for most domestic animals and laboratory animals; however, it is physiologically essential for all of them.
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From page 37...
... In contrast, ascorbic acid absorption in the rat, for which it is not a dietary essential, is a passive process that occurs primarily in the ileum (Hornig et al., 1973~. It is assumed that the absorption mechanism of ascorbic acid in domestic animals is similar to that of the rat (Spencer et al., 1963~; however, there is very little information available on this subject.
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From page 38...
... ~ ~ ~ ~ ~ ~ a' ~ ~ au a' b~o o o ~ o ~ o o o c ¢ z ~z ~z zzz ~ 4= 4~ 4J ~ 4= ~ 4= 4= ~ 4= - 4= ~ ~ 4= ~ i~ ~ ~ i~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ' ~ ~ ~ a ~ ~ ~ ~ ~ ,~, ~ ~ , ~ ~ °£ S° ~= 3 >= >~= =~= ~ ~ >= ~ A A A ~ C~J A C~ t_ C ~I ~ I C~ ~ 5 LO ~ ~ C~ ~ b_ _ / ~ / \ / \ ~ ~ / \ C~ ~ ~C~ _ ~ )
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From page 39...
... ~ala it, ~ To ~ 4= id,,, ~ ~ (u con~ ~ ~ ~ ~ ~ ~ 0 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 0 0 0 0 ~ O ~ ~ ~ ~ ~ ~ 0 0 0 ~0 0 0 -i ~ ~ z z z z ~¢ ~ ~ ¢ z z z ~z z z by ~be .= ~ .= ~·= ~ ·= ct ~ ~_~ ~ B ~ 3 .
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From page 40...
... SUMMARY 1. Excess ascorbic acid intakes in humans and laboratory animals have been reported to produce a variety of toxic signs or symptoms including allergic responses, oxaluria, uricosuria, and interference with mixedfunction oxidase systems.
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From page 41...
... Decrease in bone density in young male guinea pigs fed high levels of ascorbic acid.
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From page 42...
... 1983. Dietary ascorbic acid and hepatic mixed function oxidase activity in the guinea pig.
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Key Terms

  • domestic animals
  • guinea pig
  • dehydroascorbic acid
  • laboratory animals
  • guinea pigs

  • dietary ascorbic
  • rainbow trout
  • acid intake
  • acid concentrations
  • acid metabolism

  • acid absorption
  • dietary intakes
  • acid intakes
  • muscle ascorbic
  • acid appears

  • oxidized forms
  • acid requirements
  • toxic signs
  • dietary level
  • intake levels

  • allergic responses
  • insufficient information
  • animal species
  • egg production
  • intestinal absorption

  • mixed function
  • function oxidase
  • excess ascorbic
  • growth studies
  • enzymatic delactonization


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