A normal rooster will not harm a hen. There are those occasional roosters who will beat up on hens excessively instead of mating, but they are rare. Its also hard to imagine that this chicken was unable to get to the feed in between chasings. Finally, going broody a few days into laying is...
Getting a disease from a chicken is extremely rare, however, ingesting chicken poop could introduce bacteria that could make you temporarily ... icky. If you did not ingest it, your cause is likely something else.
It should pass. :-) I suppose you could become tolerant if you ingested it...
I would not do that to young chicks. They do not have enough experience to avoid being killed. At the very least, separate or divide the brooder. 4 weeks won't be a big issue once they are 12 weeks old.
The 28 day chicks should be ready to move to a big house now.
One is not 'better' than the other. Your conditions will determine free or not-so-free range. If your primary challenges are predators, neighbors, roadways etc, you should keep them penned. If you don't have those problems, letting them wander is entertaining for both of you, they eat more...
Straight answer? Do not light them longer than 16 total hours. Most estimates run between 14 and 16 hours.
However, lighting them is really only required for production and if you are not too worried about how productive your chickens are, you don't need to light them at all.
Professionals will tell you not to merge flocks. However, merging is a reality for most of us with small operations.
First, quantity matters. If the flocks are similar count, it helps to avoid concentrated picking. Second, room matters. Space for ones that are picked on to get away helps...
My experience with chickens is that everything that they are is genetic and I would imagine that selective pressure has imprinted directly into their brain structure shortcuts for certain types of predators. Snake detection for example may very well be 'built in' to humans (see this article)...
We are beginning to build and market products for the US poultry market. We are looking for someone with Marketing experience for either contract or freelance work that has a interest in poultry and more precisely Backyard Chickens. Please PM me to begin a conversation.
Lower your temperature in the brooder by 5 degrees each week from 95 the first week. At week 5, remove the extra heat and let them begin to get used to the cool. You will not want to shock them into the cold, so let the garage cool down or don't heat it at all. By 6-8 weeks they should be...
All I can say is that no matter what, get that 'permission' in writing. If a neighbor reports you, that agent may have to choose between his job and your jail time. Don't trust their word. The fines are stiff and the tolerance is low. Be careful.