yes pullorum and typhoid are both transmitted through the egg and both highly infectious to birds and humans. they are variations of salmonella and e. coli.I'm thinking is your heat so that they can get under it, or get away from it? Do they stay in the warm side or the cool side more?
Are they really eating the crumbles? Or just looking like they do? I grind mine down because several times in the past, I realized at day 5 or 6 that they werent' really eating the crumbles. When I ground them down, they went crazy. Do you see them drink? Make sure they know how.
I love silkies. But they are dumber than dumb. I know if I moved their food 2 feet, they had a problem finding it, LOL.
Check your temps, grind the feed down, and do not give them anything else. And make sure they are drinking.
One other thing. I dont know much about respiratory ailments, but isn't there one or two that's carried in the egg and kills them at 4-6 days? It might be one of the ones they test for., like Pullorum.
Where did you get the silkies from?
a responsible hatcher/farmer should realize a huge problem with the fertility of his/her eggs with either disease from what ive been told. thank God ive never had either one.
a disease im not sure about however is coryza. we have had it here, but never hatched any eggs when it was going on. back then we sold eggs for eating purposes and we just treated for the infection and discarded the eggs.
ok, we've probably scared everyone enough. yes all of these do exist, but hatcheries who ship their chicks are tested for this, look for NPIP logo. this does not mean their birds are 100% disease free, but it is a reassurance that they highly contagious highly fatal diseases probably aren't going to happen. when their flocks are tested, they don't always check every bird, but a sample from several birds in the flock. if everything comes back negative then they will give their approval for shipping.
most small poultry farms don't have a lot of problem with the illness mentioned above, a slightly higher chance if your showing your birds. because of this, and them not shipping their birds, they are not required to have the typhoid/pullorum test. a lot of more serious hobbyists and show people do have it done.
brian