It was probably a pre-historic taboo applied by nomadic tribes not to kill and consume cattle to provide optimal economical benefit. But scriptures say, its because its Kamadhenu : gives whatever you ask!
The latter reason makes a lot of sense now:
image via visual loop
The Bach 
In that case, there is no such thing as being a vegetarian.
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Love the post! I really feel bad for the cow!
But if you follow Tamil movies… Rajni said that in his opening song in the movie Annamalai! 😛
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hahah! good point
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Something my vegan friends should read.
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A little startling, but true .. I suppose we knew always , but did not want to ack. 🙂
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