Additive methane-mitigating effect between linseed oil and nitrate fed to cattle.

Area of Science:

• Animal Science
• Ruminant Nutrition
• Environmental Science

Background:

• Methane (CH4) emissions from cattle contribute to greenhouse gas production.
• Dietary strategies are sought to mitigate CH4 emissions in ruminants.

Purpose of the Study:

• To evaluate the effects of linseed oil and nitrate, individually and combined, on CH4 emissions and diet digestibility in cows.

Main Methods:

• A 2x2 factorial design experiment with 4 Holstein cows.
• Diets included control, linseed oil, calcium nitrate, and a combination.
• CH4 emissions, diet digestibility, and rumen fermentation parameters were measured.

Main Results:

• Both linseed oil and nitrate reduced CH4 emissions (g/kg DMI) by 17% and 22% respectively; the combination reduced emissions by 32%.
• Linseed oil increased propionate and decreased protozoa; nitrate increased rumen dissolved hydrogen (H2).
• No significant effects on total tract nutrient digestibility were observed, though linseed oil tended to reduce fiber digestibility.

Conclusions:

• Linseed oil and nitrate have an additive effect in reducing methanogenesis in cows.
• These dietary interventions can mitigate CH4 emissions without compromising nutrient digestibility.