The possible use of long chain (C19-C32) fatty acids in herbage as an indigestible faecal marker

Author:

Grace N. D.,Body D. R.

Abstract

The organic matter (OM) intakes of grazing ruminants can be calculated from the digestibility of the OM and faecal OM outputs which in turn are determined indirectly by administering known amounts of indigestible markers such as Cr2O3(Langlands, 1975). The possibility that the C19–C32fatty acids in fresh herbage could be suitable as an indigestible marker for determining intakes of grazing animals was examined. An early report had shown that when ‘Grasslands Ruanui’ perennial ryegrass (Lolium perenneL.) was fed fresh to sheep the C19–C32fatty acids appeared not to be absorbed because their concentration increased from 7·2% of the total dietary fatty acids to 23·9% of the total faecal fatty acids (Body & Hansen, 1978).

Publisher

Cambridge University Press (CUP)

Subject

Genetics,Agronomy and Crop Science,Animal Science and Zoology

Reference10 articles.

1. Preparation of fatty acid methyl esters and dimethylacetals from lipids with boron fluoride-methanol;Morrison;Journal of Lipid Research,1964

2. Fatty acid composition of the subcutaneous and perinephric fats of lambs grazed on pasture in New Zealand;Hansen;New Zealand Journal of Science,1976

3. The occurrence of C13 to C31 branched-chain fatty acids in the faeces of sheep fed rye grass, and of C12 to C34 normal acids in both the faeces and the rye grass

4. Lipids of mineralizing epiphyselol tissues in bovine foetus;Wuthier;Journal of Lipid Research,1968

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