If it's one CD by itself...mock hunts w/ a young bay dog barking or just a young dog baying in a pen. Once the CD associates the barking with a pig its a done deal.
If you already have a CD started...just walk the new CD in with the seasoned catch dog and let the newby go right beside the seasoned dog. Newby will usually follow the started dog in.
works everytime that's exactly what we do, get em catchin and take em to the woods wth a finished cd and turn em loose together