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[edit: crossposted with 2x5toes]
Sorry, it was something I had heard long ago and I have to confess quicly picking a website at not quite but pretty close to random following a google search.
Actually pus might serve a useful function when it comes to feeding young, acting as a (semi)-killed vaccine for their immune system to cut its teeth on. Or, it might be a nasty way to transmit viruses and the like. Largely depends on the severity of the infection, the stage of parent immunity, and just how much pus is involved. I would suspect that a tiny percentage of pus is completely normal, though I suspect the more pus, the less healthy the meal. This site claims that 60% of dairy cows is the US have hormone-treatment related leukaemia (which would ramp up the amount of white blood cell waste excreted in milk), thogh this site says the same proportion carry "the leukaemia virus" [sic] (citing a now deleted web page), making me think that the first site got their facts mixed up. As for the virus, I'm presuming that they are referring to BVL, which is dormant in the vast majority of cattle (much like epstein barr in humans).
Crossing species however makes a lot of that less relevant and obviously pasteurising will probably kill most contaminants, though pasteurisation is not intended to sterilise milk, only reduce the bacterial content by a factor of 10,000 or thereabouts (there are a few exceptions, notably heat resistant bacteria and fungal spores), and there is a concern about BLV possibly leading to human breast cancer via milk consumption. But either way it's still pus (would you drink boiled lymph?), something to which most people have something of a visceral reaction, and whilst evolutionary psychology is not yet the science it is often claimed to be, it might have something to say on that subject.
Also it looks like filtering can also be used as an alternative to pasteurisation, and claims that it will stay fresh longer and not result in a change in taste. Though I'm not sure if unpasteurised milk can be legally sold in the UK?
Let me assure everyone though that (pus or nay) unpasteurised milk is quite lovely. I've only had it once, on bran flakes with raisins on a warm summer morning and it was very nice indeed. |
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