this post was submitted on 14 Jun 2023
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Grass-fed doesn't really scale and entails a number of other environmental issues from higher methane to higher deforestation. Even for Ireland in particular, it's got quite a number of issues
Increased methane emissions
Grass-fed production requires longer growing times leading to more lifetime methane emissions overall. It also requires more cattle overall due to lower slaughter weight
https://iopscience.iop.org/article/10.1088/1748-9326/aad401/pdf
Not enough land to meet demand even if 100% of grassland was used
https://iopscience.iop.org/article/10.1088/1748-9326/aad401
Problems in countries that have tried to scale it up
New Zealand has tried to scale up it's grass-fed production and often touts it. To do so, they end up using heavy amounts of fertilizer in their production so much so that some regions need a 12-fold reduction in their dairy industry size just to have their water meet safety thresholds
https://theconversation.com/11-000-litres-of-water-to-make-one-litre-of-milk-new-questions-about-the-freshwater-impact-of-nz-dairy-farming-183806
Keep in mind that this is the case with New Zealand still using plenty of feed because their definition of grass-fed still allows for plenty of supplemental grain. A fully grass-fed system would fair even worse in that regard
(emphasis mine)
https://apps.fas.usda.gov/newgainapi/api/Report/DownloadReportByFileName?fileName=New%20Zealand%20Grain%20and%20Feed%20Market%20Situation_Wellington_New%20Zealand_NZ2023-0003.pdf
Problems with grass-fed production in Ireland
In the UK and Ireland, the land that grass-fed cows are on is primarily actually not natural grass-land - its natural state is temperate rainforest
https://theconversation.com/livestock-grazing-is-preventing-the-return-of-rainforests-to-the-uk-and-ireland-198014