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Operating in markets that have notoriously thin and volatile profit margins, dairy farmers deeply care about the well-being of the animals they manage because happy cows are productive cows, and that could often mean the difference between being in the black or red. One reason that a cow may have lower milk production is an inefficiency digesting its feed鈥攁n outcome that鈥檚 accompanied by cows鈥� releasing more methane, especially for pasture-grazing animals that consume legumes and grass. New research from New Hampshire Agricultural Experiment Station (NHAES) scientist is showing promise that adding a plant-based essential-oils blend known as in organic dairy cow feed can aid animals鈥� digestive process, not only increasing milk production and quality .

鈥淭here is limited research on the use of Agolin in the United States dairies, and we are not aware of any study conducted in organic dairy systems.鈥�

鈥淔eed additives used on organic dairy farms, like that at UNH and 14 others located across the Granite State, must meet ,鈥� explained Brito, an associate professor of dairy cattle nutrition and management. 鈥淎golin, with its blend of essential oils from wild carrot and coriander, meets these standards, but scientists have only just recently started studying its use on organic dairies. One of our goals with this research is to build upon that knowledge and support organic dairies in reducing their greenhouse gas emissions while increasing their production levels.鈥�

Small and mid-sized dairies鈥斺�攐ften benefit the most from research into maximizing production, as these farms have smaller profit margins and comparatively higher equipment costs than larger dairies. Additionally, there are unique opportunities to reduce enteric methane emissions in these farms through improved forage quality and use of feed additives to reduce their carbon footprint.

鈥淭here is limited research on the use of Agolin in the United States dairies, and we are not aware of any study conducted in organic dairy systems,鈥� said Muhammad Adeel Arshad, a co-leading this research. 鈥淲ith cows in confinement, farmers can control the amount and type of feed they fed to their cows, but grazing cows select their most preferred grasses and legumes while on pasture. Therefore, there is a need to evaluate Agolin efficacy as cows transition from confinement to grazing.鈥�

Brito and Arshad began studying the effects of Agolin on in the spring of 2023. They designed a study in which organic Jersey cows were each fed 1 gram of Agolin per day for five weeks during confinement (i.e., when not at pasture) following winter-feeding schedules, and for five subsequent weeks when cows began to access to pastureland.

Additionally, the study was purposely conducted during the herds鈥� transition from an indoor, winter-feeding schedule to an outdoor, pasture-feeding schedule (which typically runs from April through September) due to changes that occur in organic cows鈥� microbial populations, which can affect milk production, as the cows acclimate to new conditions and food sources. Furthermore, scientists believe that this seasonal change in diet also influences methane emissions, resulting in greater methane production as the cows begin more pasture grazing.

鈥淥ur research investigates the continuous effect of Agolin on methane emissions and milk production as the cows transition from indoor to outdoor feeding,鈥� explained Arshad. 鈥淲e will be able to share with farmers when Agolin should be added to the cows鈥� diet to maximize its effects on methane emissions and milk production.鈥�

According to Brito and Arshad, preliminary results already look promising and show that Agolin improved milk production by 6.5% and reduced the methane intensity, or amount of methane produced per pound of energy corrected milk, by 6%. The production of milk fat also increased, while the milk somatic cell count (an indicator of milk quality) reduced, with the Agolin feed.

For Brito and Arshad, a long-term goal of this research is to improve the capacity of dairy producers in New England and across the United States to market high-quality, environmentally sustainable milk while maximizing profits for small farms. This research effort鈥攃onducted at one of the two research dairy farms at the NHAES鈥攊s part of large-scale collaboration with 16 other research dairies at agricultural experiment stations across the United States is key to ensuring the success of that goal and the resiliency of U.S. dairy producers. Research efforts like this one ultimately show that improved production of milk and milk fat with reduced carbon footprint can help farmers to make informed decisions about the use of feed additives in their family operations.

This material is based on work supported by the through joint funding from the (under Hatch award numbers 7005829) and the state of New Hampshire.