The Kobe Beef Marketing & Distribution Promotion Association says :
There may well be some farms rearing low numbers of cattle who are doing things bordering on this. But, this does not mean that these rearing methods are all standards for producing prime Kobe Beef. For example, if you make it a custom of playing music at feeding time, then the cows as a conditioned reflex know that it's feeding time just by hearing the music, and this, it is said, increases their appetite. However, the affect of music improving meat quality has not yet been proved. There is also the theory that beer is useful in improving cows' appetites. Actually, however, it can be said that there have been almost no cases of cows being raised on beer. And, massage, too, is considered to be useful in lowering cows' stress because of the close, physical contact it provides and in indirectly helping to improve the quality of the meat. Once again, however, massage itself neither softens meat nor increases the amount of marbling.
Does regularly playing music to cows increase their appetite?