Implications Manure nitrogen output in hill replacement ewes can be predicted from N intake. The accurate prediction ofmanure N output is essential to reduce the environmental impact of sheep production system.Introduction Nitrogen (N) excretion from sheep production systems is a considerable source for groundwater pollutionand global warming. The efficiency of utilisation of N can be used to calculate N excretion as an environmental footprint.The aims of this experiment were to investigate how different forage and breed types affected the efficiency of utilisationof N and to use these data to develop relationships between N intake and output in hill replacement ewes.
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