I believe this would solve your problem here...........

If the client is planning on using the same image that goes with the slogan, then you'll have to find a translation that plays on “veta” as in the grain of wood and “veta” referring to the streaking/marbling in meat. The ad apparently shows a slice of ham next to some fine wood. Have a look:

http://www.theslogan.com/es_content//index.php?option=com_co...

The only thing I can think of is to change it a bit (to fit the image as much as the slogan) and say something like, “Both rely/depend on the finest grains (in the world),” “Both start with the finest grains” or something else that will allude to wood grain/grain fed. (Of course, if this is for acorn-fed ham, it won't work at all.)

You might want to point out to the client that some things just don't translate--especially in the world of advertising.