Scientific article on part-time grazing and methane emissions

The article describes a study of 24 dairy cows that were examined with regard to production and methane emissions in a part-time grazing system in northern Sweden. Half of the cows grazed only during the day (10 hours per day) and half grazed only at night (12 hours of night grazing). Both groups were fed the same feed. Enteric methane emissions were measured both indoors and outdoors using two linked GreenFeed TM devices. There was no statistically significant difference in feed intake, milk production, or daily methane emissions between day and night grazing. A rapid decrease in daily methane emissions (28%) was observed when the cows moved outdoors to graze, and this applied to both night and day grazing treatments.

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Effects of daytime or night-time grazing on animal performance, diurnal behaviour and enteric methane emissions from dairy cows at high latitudes