Unless you have a large amount of birds you need to do, you probably don't need a gun. Idk about the Marek's vaccine in particular, but ik when I brought the fowl pox vaccine it came with the applicator included and it was easy enough to use. How many birds do you currently have and how many...
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Even though it says it's for nonlaying hens, I would keep them on it since you have a rooster, you'll just need to provide oyster shells on the side. I feed mine kalmbach flock raiser, but the Purina is fine too. Keeping laying hens on flock raiser won't hurt anything as long as...
That does sound more like a rat or a raccoon than a cat to me as well. With so little to go on though there is no telling. I would if possible bring them inside at night but the hardware cloth should solve that issue anyways. Regardless I wish you luck with the rest of your chicks!
The one that surprised me the most is a bobtailed cat. I initially thought she was a bobcat but once I got a better look at her and her kittens I realized she was a feral bobtailed domesticated cat
I would also suggest vaccinating the rest of your flock, you can order the vaccine from valley vet and it's cheap and easy to use. Won't help your sick bird but it'll keep everyone else from getting sick
Another thing is human aggression can also be genetic so if you breed him, his sons are more likely to be human aggressive, I would cull him personally, there's a small chance behavior modification could work for him, but he has already shown he has bad genes in regards to temperment so this...
It's extremely unlikely it's a dominance issue, chances are it's a nutrition issue. If they're knocking the container over, I'd try a small hanging feeder with the oyster shell. It's normal for them to only occasionally eat the oyster shells, they'll only take what they need when they need it...
I would switch to a 20% feed and cut out the bsfl for a while. She might be eating eggs 'cause she's not getting enough protein. Generally it's better to have calcium on the side so birds who need them can have it while birds that don't won't be have too much