A study of the relative amounts of the protein and non-protein nitrogenous constituents occurring in pasture herbage, and their significance in the grazing of the herbage by stock

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Abstract
Occasional occurrence of digestive disturbances in stock grazing on intensively manured pastures, presumably owing to an abnormally high proportion of non-protein N, prompted analysis of such pasture in 1930. In herbage with 2.8-5.2% of total N in the DM, the non-protein N, as % of total N, was 12-23, of which amide N was 2.7-8.1, ammonia N 1.0-2.0, and nitrate N 0.1-4.0. No obvious relation was found between amide N, ammonia N, and total N, though the higher values of the last were usually associated with the higher proportion of non-protein and nitrate N. Although the tendency towards digestive disturbances seems to be associated with occurrence of more than the normal (10-20%) proportion of non-protein N, a more precise definition of the cause is not yet possible.

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