Absorption of tricarballylic acid from the rumen of sheep and cattle fed forages containing trans-aconitic acid
✍ Scribed by James B. Russell; Henry F. Mayland
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 363 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
A BSTRA CT Some forages accumulate high concentrations (4% of dry matter) of trans-aconitate, and this acid has been implicated in Mg chelation and the occurrence of grass tetany in ruminants. In vitro experiments have indicated that rumen microorganisms convert trans-aconitate to tricarballylate. The feeding studies described here were conducted to demonstrate absorption of tricarballylate b y ruminant animals fed diets similar to those producing grass tetany. When sheep were switched from a diet containing alfalfa (lucerne) (Medicago sativa L.) hay (no detectable trans-aconitate) to wheat (Triticum aestivum L.) and rye (Secale cereale L.) forage containing 1-52 and 1.37% trans-aconitate, respectively, there was a rapid increase in blood plasma tricarballylate. Trans-aconitate was not detected in the plasma. At 16 h after feeding, plasma tricarballylate concentrations were 0-58+0-08 and 0-48kO.21 m M in sheep fed the wheat and rye forage, respectively. Tricarballylate concentrations remained relatively constant for the remaining 60 h of the experiment. Cattle were fed rye forage one week later, and the concentration of trans-aconitate in the forage had dropped to 0.83% of the dry matter. Once again there was a rapid