For most of human history, cattle, sheep and goats grazed on land that wasn't suitable for ploughing, and in doing so they converted inedible grass into edible meat and milk.

在人类的大部分历史时期，人们在不适合耕种的土地上放牧牛羊，这样它们就把不能食用的草转变成了肉和奶。

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The UK's Food Standards Agency says the recently revealed sale of beef and possibly milk from the offspring of cloned cattle is unlawful. So what is all the fuss about?

英国食品标准管理局声称：最近被发现销售来自克隆牛的后代的牛肉~甚至可能是牛奶，都是非法的。

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Ninety percent of the U.S. milk supply, for example, comes from the Holstein breed of cattle.

比如说，美国百分之九十的牛奶来自于霍斯坦牛种。

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Schmallenberg virus (SBV) causes fever, diarrhoea and loss of milk production in adult cattle, although the animals do recover.

BBC: Schmallenberg virus: Scottish farmers put on high alert

Coincidentally, these regions also saw the domestication of cattle and the adoption of milk-drinking by adults around the same time.

WSJ: Matt Ridley on Human Culture's Effect on Genes | Mind & Matter

During his two years of research, Kardashian followed the trail of milk from the small pastoral farms that dot the countryside around his Vermont home to the industrial dairy cattle plants of the Midwest, and 12, 000 years back in time to the dawn of dairy farming.

FORBES: Kardashian's Debut Book Tackles Serious Food Issues