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Testes are solid, they don't really seep. They secret a fluid, but they aren't filled with fluid. They're very easy to remove intact. In an older roo they can be quite large, it would be hard to miss them, and you wouldn't be likely to accidentally leave them in. They come out when you yank out the rest of the innards. The only part I know of that can cause flavor problems (other than the intestines, if they're ruptured-heavy "ick factor" there) is the gall bladder. If that ruptures, the bile in the gallbladder will make the meat it touches bitter. But you can trim that off. It won't ruin the whole bird, as long as you removed the contaminated area(s).
I've gotten store-bought birds that had bits of lung, the testes, (the tiny testes of 6 week old birds are often still present in supermarket birds) trachea, and a few other bits left behind. I removed them before cooking, (if I saw them, I've roasted a few whole birds that still had all or part of the lungs left in, as well as the testes) and it didn't affect the taste.
Feed lot cattle are not bulls. They are castrated young for meat, so that they gain weight faster.