During fattening, the pigs on the Dutch farm of De Groot receive a handful of alfalfa each day. That helps improve gut health and reduces the emission of greenhouse gases. A number of studies have been conducted over the last decades, looking at how nutritional changes can decrease the emission of greenhouse gases. Most studies have been done on cows. A new study, published in the journal Animal Feed Science and Technology, looked at the pig sector and delved into the impact of reducing dietary crude protein and increasing total dietary fibre on hindgut fermentation, the methanogen community and gas emission in growing pigs.