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The Wisconsin School for Beginning Dairy and Livestock Farmers: Keeping the Dream of Farming Alive

As older farmers retire, fewer young farmers are stepping in to take their place. The number of beginning farmers dropped 20 percent in the last five-year census period, and the average US farmer now tops 58 years of age. more

CIAS Mini-Grants Support Graduate Student Research in Sustainable Agriculture

CIAS supports innovative graduate student research addressing the challenges faced by small- and medium-sized farms and food businesses. Awarded annually, our competitive mini-grants aid students as they initiate their research in sustainable agriculture and food systems. more


Announcing the 2019 Market Farm Madness Champion!

Hoophouse is your 2019 Market Farm Madness champion! They withstood high winds, late snow storms and controversy over cost share payments to win the tournament. more

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Comparing Greenhouse Gas Emissions of Dairy Systems (CIAS Research Brief #101)

Posted March 2019

Greenhouse gas emissions from livestock farms have received a lot of attention in recent years. Some studies have concluded that intensive confinement systems have the lowest greenhouse gas emissions per pound of milk or meat produced, while other studies have found that grass-based livestock farms have the lowest net greenhouse gas emissions.

Calculating greenhouse gas emissions of different farming systems is complex, and the results of each study depend on the geographic area considered and specific assumptions about management. When researchers at UW-Madison compared greenhouse gas emissions of several different dairy farming systems in Wisconsin, they found that emissions were broadly similar between grazing and confinement dairies. Most studies comparing greenhouse gas emissions of conventional and grass-based livestock systems do not examine the effect of management differences within each of those approaches. This study looked at the effect of different grain supplementation rates on emissions from grazing systems, and at the effect of adding an anaerobic manure digester on emissions from confinement dairies. The study showed that details of manure management, feeding strategies, and crop production decisions affect total greenhouse gas emissions more than whether or not a farm practices grazing.

In this model, the confinement system with the anaerobic digester resulted in the lowest overall emissions, primarily because the energy value of the methane produced in the digester reduced the need to burn fossil fuels for electricity generation. For all the other dairy farms, this model found that approaches balancing pasture intake and feed supplementation to optimize milk production resulted in the lowest greenhouse gas emissions per unit of milk produced.

Read the full brief (PDF)