Justin Bieber may get the girls screaming, but he just doesn't cut it on the dairy farm. The 'girls' producing Britain's milk seem to prefer to kick back and relax listening to the classic crooner Frank Sinatra, after a dairy farmer studied how music affected them.

Andrew Gilman from Tamworth discovered that his cows have impeccable taste in 'moo-sic' as when listening to Ol' Blue eyes milk production rose by 2.3%, that's an additional 2 pints per cow, putting Frank firmly in the number one spot this Christmas. Andrew played teen sensation Justin Bieber's new Christmas album Under The Mistletoe for one week and Frank Sinatra's classic The Christmas Album the next and found this remarkable rise in milk yield.

Andrew says: "As it is Christmas, we wanted to get our 'girls' into the festive sprit.  We usually have music on in the milking parlour where all the cows stand to be milked and the cows are always pretty relaxed but we wanted to try something more Christmassy.

"The cows are always happy during milking but I think they really enjoyed the festive tunes it seemed to make them really chilled out. I was relieved they preferred the Frank Sinatra album - it's a classic. But it is incredible to see such a rise in milk production!"

Amanda Ball, head of communications at DairyCo, the levy-funded organisation that works on behalf of British dairy farmers says:

"The health and welfare of our cows is a number one priority. Keeping our cows happy and healthy is good for them and good for us and we also wanted to help get them into the moo-d for Christmas."

Karen Lancaster, cow behavioural expert, says:

"Having music on creates a nice, consistent and relaxed environment in the parlour that becomes familiar to the cows. This is the type of atmosphere the cows are happiest in, which is possibly why Andrew saw a rise in milk production."