I'm reading the question two ways...
1) Farms tend to have their milk pooled together at the dairy companies so it's not necessarily the case that the you'll have the same cow serving you more than once (but also possible).
2) Answering a more interesting question, have you d*unk the same milk from the same cow? It's feasible that a nutrient (water, amino acid or whatever) has cycled through the same animal more than once. For example: a molecule of water from the rain, passes to the cow, it's secreted into the milk, you drink it, you pee it out, it's evaporated, rains down on the same area and the same cow reingests it.
I CBA doing any maths as to the probability of this, but confident it's jolly UNLIKELY  (but theoretically possible).
Can you tell my brain is working overtime?!  |
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