OK, let me see if I'm understanding this right. You are looking for a rooster that will give his life protecting the flock, correct? Is that all that you're looking for? You want a rooster that is going to fight off predators. Here is the thing - unless you have an endless supply of roosters, you're going to need another line or two of defense. After all, once your rooster gives his life, what's going to protect your hens? If you have a heavy predator load, you could have a lot of dead roosters to replace. Do you free range? What is your environment like - woods, fields, city, suburban, rural? Do you have any cover for your chickens if they're out free ranging? What is your coop/run setup like? I like having a rooster around, but I don't depend on them for all my flock's protection. If you have a lot of predators around and your chickens are in a run (preferably covered), electric fence around that run is your friend. If you want to move them around the yard, electric netting is a good thing.
We free range, so we know that there is always a chance a chicken will die. A few years ago, we had a coyote take about half my flock in a very short time. We were gone, but I can only guess that the rooster got taken first, then the rest of the birds. This fall I had a cockerel give his life protecting one of the flock. I had three, but I also have enough hens that they weren't overbred by the number of cockerels. Had the one that was killed been the only one, I'd be out of luck right now. After that loss, my chickens were cooped for a couple of weeks to hopefully discourage whatever killed him.
If you're looking for a rooster to call an alarm, find tidbits for hens, and put them to bed at night, you really don't need one. A dominant hen will watch and alert for predators. Hens are perfectly capable of finding their own food and going into the coop on their own at night.
We free range, so we know that there is always a chance a chicken will die. A few years ago, we had a coyote take about half my flock in a very short time. We were gone, but I can only guess that the rooster got taken first, then the rest of the birds. This fall I had a cockerel give his life protecting one of the flock. I had three, but I also have enough hens that they weren't overbred by the number of cockerels. Had the one that was killed been the only one, I'd be out of luck right now. After that loss, my chickens were cooped for a couple of weeks to hopefully discourage whatever killed him.
If you're looking for a rooster to call an alarm, find tidbits for hens, and put them to bed at night, you really don't need one. A dominant hen will watch and alert for predators. Hens are perfectly capable of finding their own food and going into the coop on their own at night.