Odeon-cats should NOT be given milk, it can make them ill.
Just to be argumentative:
I've given cats milk off and on without noticeable/unwanted results. The key is moderate, infrequent amounts.
However, I did have a dog that was allergic to milk. It took us almost $1,000 in tests and visits/antibiotics because she kept getting bronchitis. Figured out on my own, that I was the cause of it, giving her cheese.