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This has been playing on my mind for a while and I thought it was time to ask!

In any supermakert, there is usually at least 5+ regular brands, then 3-4 supermarket brands. In addition to some supermarkets stocking expensive/specialised brands.

Forgetting margarine or low fat/special butter where chemicals are added, traditional butter is just milk with salt sometimes added.

Now, it doesn't matter where I buy milk from, it always tastes the same. Considering this and that traditional butter is just churned milk... Why do different brands of butter taste different!?

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Different brands of milk definitely taste different to me... –  rfusca Sep 22 '11 at 16:47
    
@rfusca - I can't vouch for everywhere, but, I have cereal most mornings and buy my milk from whatever shop I am nearest at the time... obviously different grades taste different, but, I usually buy semi-skimmed and it tastes the same no matter what supermarket I buy from :/ –  wilhil Sep 22 '11 at 17:49
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FYI Napoleon Dynamite could tell from its milk what the cow had been fed, so there must be differences between milks. –  Doug Sep 22 '11 at 19:14
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4 Answers

I am guessing here, but it is an educated guess. I think the reason why the difference in flavour might be greater between different butters than between different brands of milk is that the fat content in butter is so much higher than it is in milk. Just think about meat: The main flavour component in any meat is the fat. If you take a lean cut of beef and compare its flavour to that of equally lean pork, chicken, duck etc. they will all taste quite similar. If you do the same comparison but with high-fat cuts the difference in flavour will be huge. Ergo, it should be the same for milk vs. butter, especially if you compare different brands of semi-skimmed or skimmed milk, where the natural fat content is reduced. But as I said, it is just an educated guess. Please correct me if I am wrong.

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Just to add a little bit on this. It would be the fat, butter is almost all fat and as you guessed it not all fat will taste the same. It is all about the feed the cow is given. This is why steak from a grass fed cow tastes different from a per corn fed cow. The flavors will be more pronounced in things like butter with a higher fat content and cream. –  jeffwllms Sep 23 '11 at 13:49
    
Also there is another component to butter tasting different. They are not all processed and made equal. Some actually have a higher fat content (not a lot but higher none the less). Some are churned, and the machining methods for this vary between manufacturer. And others are cultured (like a french or European style) to produce there butter. I for one favor the higher fat cultured butters. –  jeffwllms Sep 23 '11 at 13:53
    
Since trying higher fat, cultured Irish butter I am NEVER going back. The taste is MILES better, oh man. And re: the taste thing, I don't like plain milk, but the closest I ever came to liking it was when we got milk from a local dairy delivered when I was a kid - had a totally different taste from any other milk I have ever had. –  Katey HW Sep 23 '11 at 14:06
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Milk doesn't always taste the same, especially the organic brands which also have different nutritional values as well. It can taste quite different, but not completely. Also the ability to taste is subjective. Some can detect these differences while I suppose others cannot.

As to why the butter can taste different. The listed ingredients only make up part of the taste (those ingredients which have to be listed according to the FDA, not every ingredient is necessarily listed). A major factor in taste is how it is processed and preserved (preservation processes may occur more than once at different times). As food gets old it is going to lose flavor and/or taste different. To hide this there are many preservation techniques to mask this. Adding "natural flavor" (IE: highly concentrated artificial flavor derived from "natural" sources) to mask this is consider preservation and not required to be listed as an ingredient.

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I agree with franko that the cow's diet will have the largest effect on the final flavor of the butter. This includes changes from season to season as the cows move from grazing outside on fresh grass to inside on hay during the winter.

In addition to that, some of the specialty butters such as Lurpak are cultured with bacteria that enhances the flavor.

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I'm going to guess that it's all based on the diet of the cows. Grass versus hay makes cheeses taste different, so I don't see why butters and milks should be any different.

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