The addition of 3-Nitrooxypropanol to the feed of dairy cows reduced their enteric methane emissions by about 25% in a recently published study — one in a series of Penn State studies of the investigational substance in the United States — which might be an early step toward it being approved for use in this country.
Often referred to as 3-NOP, the compound inhibits an enzyme that is crucial to the final stage of methane synthesis in a cow’s rumen. When 3-NOP is fed to cattle, their methane production is inhibited, explained researcher Alex Hristov, distinguished professor of dairy nutrition, College of Agricultural Sciences.
In addition to exploring 3-NOP’s effect on enteric methane emissions, the 15-week study conducted at the Penn State Dairy Teaching and Research Center examined 3-NOP’s influence on rumen fermentation, lactational performance, sensory properties of milk and the resumption of ovarian cycles in 56 lactating dairy cows. The results, which were published in the Journal of Dairy Science, confirmed those of other 3-NOP trials conducted at Penn State and around the world, according to Hristov.
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