Haemolytic amino acid in Brassica forages
1996
Helclova, Z. (Jihoceska Univ., Ceske Budejovice (Czech Republic). Zemedelska Fakulta)
The use of Brassicaceae forages as a winter feedstuff for ruminants has been limited by the occurrence of haemolytic anaemia. Typical signs accompanying the anaemia are loss of appetite, reduced weight gain, fall in milk production in cattle and wool production in sheep. Poisoning results from ingestion of free amino acid (+)-S-methyl-L-cysteine sulphoxide (SMCO) which is by rumen bacteria converted to methanethiole and dimethyl disulphide. These volatile toxins are absorbed from the rumen to blood stream and cause haemolytic anaemia. Nutritive value of Brassica forages and distribution of SMCO within them are reviewed.
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