All Nordic, high latitude, high elevation cultures ate meat as a primary diet source. Because beef and animal products are much easier to grow in marginal conditions than a proper low meat diet. Grass will grow in colder dryer conditions.
Once gain our "modern" ideas getting in the way of reality.
Actually the Irish before the English invasions and before the potato ate a lot of dairy products; butter and cheese especially, cattle were MONEY (hence all the lore about The Cattle Raid of This and That) so you only ate the old, the surplus males not needed for Oxen and those picked out during Slaughter Month (usually October aka Shamain in Ireland/Last Harvest) to salt down and use as salted meat during the Winter.
Like most Northern cultures in Europe; there was a lot of meat eaten at certain times of the year; usually in the Fall but most of the rest of the year meat got used as flavoring (usually dried, salted or smoked); this also depended on social status - the Elites ate a lot more meat, but by the early Middle Ages they also had the hunting rights.
The Irish (and most other Northern Europeans) did eat a lot of pork; especially before the take over (after which the family pig became "The Gentlemen who Payes the Rent" and was usually sold and/or one piglet was kept on and made into "bacon" (aka salt pork) which was eaten for the entire year.
Most people kept chickens and a lot of eggs were also eaten, a chicken was probably the meat most often seen by the average person, along with rabbit after the Normans brought them over as a favorite food around 1100.
The built of the diet before the potato came in around 1600 for most people was a combination of oats, barley, occasional wheat (if you could afford it) milk, butter, eggs in the season, all sorts of berries, nettles, seaweed, fish (on the coasts), onions and some beef/pork/lamb on feast days or if an animal either died or needed to be culled (feasts were often at slaughter time).
Huge hordes of butter are still found in bogs, sometimes as much as 2,000 years old; the bog "butter bags" had great powers of preservation and technically the stuff is often still edible though no one does these days, there are reports of people digging up old bog butter in the 18th and 19th centuries and happily eating it.
The Swedes/Norse tended to eat a varied diet but it was also seasonal when it came to meat; coastal people ate a lot of fish (and it was also pickled) pork was probably the most important meat along with hearty breeds of chicken (such as those that became the modern Icelandic breeds), beef was an upper-class food, but again any farmer was likely to eat an old cow or unwanted calf, but again most of it would have been made into sausages and smoked down. Horse meat was also important to the Norse, and they still eat it in Iceland, Germany, and the Nordic countries (too strong for my liking even as sausage).
In all these places the butter, cheese, milk and kiefer type products were much more frequently eaten than beef was; I almost forgot goats which are/were everywhere; but you don't get large scale sheep farming (they exist but not in the great numbers they had later) in most places until later; and again they were wanted alive for their wool, with castrated males producing the best fleeces.
OK enough thread drift, but interesting for us who live in the Northern areas in terms of preparations; IF things collapsed to a traditional lifestyle, having pumpkin, turnip, and other root crops to store when hay is limited could make the difference between getting your milk cow through the Winter and not be doing so.
Worst of the rain storms are over for now; this week is supposed to see some of the first "real" Spring weather (50 degrees) but fields are still way to wet to be useable and the predicted showers may keep the pastures from drying out for another couple of weeks.
This is USUALLY the time of year we get some of our best weather (I have visitors from the US that have come several times and are convinced Ireland is sunny, mild and pleasent all the time lol) we sometimes get days in the 70's with "soft" misty rain and sun (great for crops) we also often get lovely warm weather in the late Fall; when the winds blow "backwards" from Spain, a similar weather pattern that produced all the snow and cold this year when it blows in from Russia.
We have many years when this time of year is the only "Summer" we get, with it returning to a pattern of rain, cloud and gloom pretty much for days on end; the joys of living next to the Atlantic.