Welcome from northern NY!!! Thats quite a lot of rabbits. Do you show?
I have 3 purebred steel Dutch, and 2 NZ mutts. Comparatively, I'm just starting out with rabbits. So far, its been very rewarding(and sometimes frustrating).
Yay!!! New rabbit people!!! Rabbits are not as easy as they are made out to be, but they are not as much of a pain in the neck as many other animals. What purpose would you want your rabbits to serve?
You may not be overthinking it. Rabbits do breed like rabbits, but only when you dont want them too. There have been 3 month old bucks that are capable of breeding, even without completely developed testicles. Although it is very unlikely that the litter was sired by the black buck, it is not...
If she was the more submissive of the two fighting rabbits, the thinness may be the result of the dominant one not allowing her to eat. Thats one of the dangers of keeping more than one rabbit in a single cage. She may still be afraid to eat.
If they are killing your birds, they should go. Are they in any better physical condition than what you found them in? Is training them not to bother the chickens out of the question?
The chicken food may have been a part of it. It just isn't what rabbits should be eating, and he probably ate way too much. Rabbits do not have good self control; they will eat until they get sick.
If your garage is dusty, that could have been the cause of the watery eye.
Thats awesome! Watch to be sure that they are all getting fed, since the kits greatly outnumber how many a single doe can feed at one time. In such a scenerio, little ones get pushed to the side.Is there any way you could foster out a couple of them? But they all look super healthy.
6 weeks minimum, at least for non-production rabbits. Meat rabbits, like NZs, are weaned earlier, because the dam needs to be bred closer apart. For show rabbits, 8 weeks is best. You want those rabbits to get a glossy coat and good body mass. But it really depends on the litter. I've seen...
Does he have any Netherland Dwarf in him? They are very prone to malcullusion(the misalignment of the teeth), so it may be showing up in him. Turn him over and check his teeth. Give him soft food(fruit, greens, water, hay), and closely observe his behavior. If he does have something lodged in...