J. Anim Sci.
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J. Anim Sci. 1963. 22:1081-1085.
© 1963 American Society of Animal Science
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Vitamin A Destruction by Nitrite In Vitro and In Vivo1

W. K. Roberts and J. L. Sell

University of Manitoba, 2 Winnipeg, Canada

Abstract

In vitro and in vivo studies were conducted to investigate some effects of nitrite on vitamin A destruction in sheep and chickens. The addition of KNO2 to either abomasum or ventriculus fluid, where pH was below 4, resulted in rapid vitamin A destruction. But in rumen, crop or intestine fluid, where pH was above 6, relatively little vitamin A was destroyed in the presence of KNO2 during a 60 minute incubation period. When 2.0% of KNO2 was fed to fistulated sheep no nitrite was found in either rumen or abomasum fluid at approximately 90 minutes after feeding. Furthermore, there was relatively little difference in vitamin A concentration between abomasum fluids collected from sheep receiving the control and nitrite rations, suggesting that dietary nitrite did not enhance vitamin A destruction in the sheep. On the other hand, when broilers were fed 0.74% of KNO2, nitrite was found in ingestaobtained from the crop, ventriculus and intestine at 2 hours after feeding. In addition, the concentration of vitamin A in both the ventriculus and intestine ingesta obtained from birds receiving KNO2 was much less than in similar ingesta obtained from control birds. These data suggest that in the presence of nitrite vitamin A is destroyed in the ventriculus area of the digestive tract of the chick, where the pH is approximately 4.

Footnotes

1 Appreciation is expressed to Pfizer of Canada and Hoffman La Roche, Limited for kindly supplying vitamin A used in these studies.

2 Department of Animal Science.






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