Ireland is being made to shrink its dairy herd, with healthy in-calf cows going to slaughter early, to satisfy a nitrogen figure set in Brussels. Start with how cruel the timing is. Barely a decade ago, when the EU scrapped its milk quotas in 2015, Ireland told its farmers to do the opposite. Expand. Grow the herd. Build the new parlour. The government's own strategy pushed dairy hard for export growth, and thousands of families borrowed heavily and did exactly as they were asked. Now the same establishment that cheered them bigger is ordering them smaller. The instrument is a rule that sounds technical and harmless. The EU caps the nitrogen that livestock manure may spread on the land. Ireland's grass-fed dairy farms, among the most efficient and lowest-carbon on earth, held a hard-won allowance to graze a little heavier. After a water-quality review, that allowance was cut, from 250 kilos of nitrogen a hectare down to 220, across great swathes of the country from 2024, and it has stayed under threat ever since, its conditions tightening at every review. To drop under the new line, a farmer has three doors. Find more land, ship his slurry away, or get rid of cows. Land is scarce and the squeeze itself sent rents soaring, so for many the only door left is the herd. The Irish Farmers Association reckoned an extra sixty nine thousand acres would be needed nationally just to stand still. One senator, a farmer himself, warned that up to forty one thousand cows, a great many of them pregnant, could be sent to slaughter to comply, and called it an animal welfare catastrophe in the making. Sit with that. Healthy, productive, in-calf cows, on some of the greenest grass in Europe, culled early because a stocking number on a form moved by thirty kilos. The very cows the nation was begging the farmer to buy ten years ago. This is what modern environmental policy looks like at the sharp end. A good cow loaded onto a lorry she never needed to be on, on a wet Tuesday in County Cork, to shift a figure in a spreadsheet.