
If you ask about breeding on a forum where there are people who advocate responsible breeding, then you will, I'm afraid, get advice that you weren't looking for. There are simply so many people breeding, not realising the risks involved, and the potential financial lay out. If all goes well, you may break about even, but overall expect to make a loss. I can't really see why you'd want to breed on, but that's my personal view, not meant to offend as I would think if you'd want to establish any sort of breeding, you would be better off buying in a KC registered pup, and starting from there, researching the lines, see what you've got as your bitch develops and look at what's being produced. If you look at Rivermeadow Labradors, Katy does agility with her Labradors, and does really well, I don't know if you've heard of them before, but she has had 4 generations of 0/0 hips and elbows with her Labradors. She also works them during the shooting season.
The health tests for Labradors have been mentioned, I know there are some similarities between the health tests for both GRs and Labs, but I think the form of PRA is different for GRs, so this may need testing for separately, or, if you buy a bundle which tests for more than one condition, they may both be included. The test I did on my bitch included about 150 conditions, many of which weren't relevant to Labradors, but there were about 15 or so that were from memory, some of which aren't a problem in the breed. I'm not sure if the BVA eye test is similar/the same, they are now testing again, so you need to find an opthalmic specialist vet, a list can be found on the BVA website. Most breeders do that test first, as it's relatively cheap (approx £60 plus fuel), if they have a clear BVA eye certificate then obviously it's worth then spending the money on the rest of the health tests. Some people travel to use vets that are experienced in taking plates to be submitted for hips and elbows, I do now, as I had some plates taken by an inexperienced vet that were so poor they were rejected by the BVA, so you need to ask around for recommendations.