Abstract
The initial phase of a long term milk urea nitrogen (MUN) project consisted of a six month (May - Oct 99) observational study 75 dairy herds in Prince Edward Island, a temperate-climate, maritime province on the east coast of Canada.
 Several studies have shown that MUN levels increase when cows are put on pasture (1, 2, 5 ). Ubertalle (4) found that MUN levels were related to grass quality and composition. Lean (5) reported that as pasture develops, the energy content and protein percentage of the dry matter (DM) decreases. Intensive pasture management reduces back grazing and promotes pasture regrowth (5), allowing the energy content and protein percentage of the dry matter (DM) to persist longerthan with low-intensity pasture management. This study describes the relationship between pasture management, precipitation, and observed MUN levels in dairy herds.
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