Search for a toxic compound
With the science of how and why ruminants die from PE-like sudden death phalaris toxicity now at hand, the challenge is to find what compound in phalaris is toxic to ruminants.
Dr Colegate examined pastures from which animals died from PE-like sudden death. These toxic samples had large quantities of the alkaloid N-methyltyramine.
Fresh phalaris shoots after the autumn season break could prove lethal to sheep because they contain a high nitrogen load.
In an experimental trial of the toxicity of N-methyltyramine, carried out during November 2005, sheep were fed a maintenance diet and then provided with unlimited quantities of nitrogen-rich, green lucerne. This mimicked paddock conditions at times of phalaris toxicity.
No mortalities were recorded, suggesting the peracute ammonia toxicity was directly related to the consumption of phalaris but not related to the N-methyltyramine.
..Its deep-rooted system makes it an attractive grass to assist with improved water-use efficiency to help lower the watertable and reduce the impact of salinity. Phalaris also has the capacity to reduce soil acidification.