Sydney Acres
Songster
Both would do well, if you got individual roosters with the right temperament. But neither would be my first choice if you don't have an interest in those breeds otherwise. Both Dorkings and Jersey Giants will likely have less speed at a run than a RIR or similar bird, because the Dorkings have such short legs, and the Jersey Giants are so large and bulky. Also, both of these breeds have roosters that get very large, so if you don't have large hens the roosters could injure the hens during breeding.Hey guys so i guess this would be a good place to ask. I am trying to decide either to get a Black Jersey Giant Rooster or a Silver Gray Dorking Rooster. Which would protect the flock better?
Realistically, the rooster protects the hens from raptors and dogs not by winning the fight, but by being alert enough to warn the hens of any threat early, and by being willing to sacrifice himself long enough for the hens to escape to safety. Size isn't nearly as important as attitude, because even a big rooster is unlikely to win a full-on battle against a dog or an eagle, and a small rooster that appears threatening can do just as well as the big boys at intimidation. And the small bird may not pack as hard a punch, but it can still do some damage and will likely be more agile.
Depending on your setup, you might also do well with two or more roosters working as a team, assuming you have enough hens, and enough room for adult males to coexist peacefully. I have 2 older Croad Langshan roosters that work beautifully together -- one always watches the sky while the other looks over the hens (I live north of Seattle, so there's lots of bald eagles, hawks, etc). When a raptor is spotted, one rooster escorts the hens to safety while the other one moves out to an open area so the predator focuses on the obvious prey. As soon as the hens are under cover, both roosters join them, one facing the obvious threat and one facing the opposite direction. They've learned from experience -- the bald eagles around here hunt as bonded pairs, so there's often a second hunter that sneaks in from the opposite direction. It's amazing to watch them work, and there have only been minor injuries from the raptors so far. I recently added a young Red Dorking rooster and 14 young hens to the flock, and the young rooster is learning his duties.
As far as protection from stray dogs, you're likely going to lose your rooster if the dog has any hunting skills at all. That might use up enough time to allow the hens to get to safety, assuming there is a safe place to go. But dogs are different than coyotes -- coyotes will kill and take away one bird to eat, whereas many dogs will kill an entire flock of birds for sport and leave them in place. A rooster can help, but the best defense against stray dogs is a good fence, preferably one that is dig-proof and climb-proof. A livestock protection dog (that is trained to protect poultry) will also help, but it can't adequately protect against dogs running in a pack.