I need to do some testing this year and am confused as to which tests are most valuable and what medium (blood or milk) is best to test. The best vet I can find recommended a blood test for CAE

and I am beginning to think a colostrum test is more valuable and cheaper.
Which tests would you do for dairy goats?
I am definitely thinking TB, brucellosis, and CAE.
Would also like to test for Johnnes, in case there is a real connection between that and Crohns. Can Johnnes ever be carried silently? My animals have never been sick or in poor condition...
On CL - is it of value to test healthy animals?
Are there any other tests I should be considering?
If you collect your own samples which labs do you use? Please give contact info along w/ the name.
LOL can you tell I am a beginner? I've "played" with goats long enough. Now it is time to find out how to make it in the real market