Love the foxhole image. I have a white Marans hen that is insisting on laying her egg in my trash can today. I have shooed her out all morning but she is determined......She also likes to hide in any small place she can fit in.
Oh sick chickens and the people that sell you them without warning you....At first my response to a sickly chicken was to cull it and treat the rest with medicine. Then I realized you never get rid of some of these diseases. Wild birds carry them, people,feedbags etc. you have to learn to prevent them otherwise you would eventualy just kill every one....
"Let Food be your medicine and your medicine be food"-Hippocrates
Rule #1 of chicken farming...KEEP THEIR FEET DRY
There are several things that can help boost the immune system in people and animals. I have been studying chickens and their immune systems more this past spring and I have found a few things that seem to work. Most of this comes from what I know about hoslistic medicine for humans but I took into consideration that chickens are not mammals and heve a somewhat different immune system. For instance humans have 6 different leukocytes while poultry only carry five. All of the factors that determine the quality and quantity of these disease fighting factors are found along the chromosonal chains which means that yes, succeptibility to illness can be a hereditary flaw. Some people may choose to cull these birds immediately others may want to save them.
SO if you a person that hates to kill something without giving it a chance then you can naturally boost their weak immune system simply by changing their diet. That has been my project this spring. Yes, I do get obsessive perhaps I should have stayed in school......
First and most important OBSERVE your chicks as many times as possible every day. I call it "Chicken TV" I can spend hours watching them. You will notice signs of illness sooner if you become aware of their normal behaviors and sounds. DO NOT dismiss a sneeze or odd squishy squeak. Also shaking of the head is a sign that they are tying to dislodge mucus and so is scratching thier face/beak. If you wait for the poo it can be too late. The intestines are wonderful self clensing things, they expell most micro organisims and bacteria before it can pass through the blood stream. By the time the lining has been stripped enough to cause poo that looks bad the disease will have already filled the chicks little body. A few other secondary signs are also ruffled feathers, holding the head back into the shoulders or tucking it under the wing and unthriftiness.
If you have a sick bird or a couple/few sick birds try to isolate them. More so that you can monitor their food/water intake. Resist the temptaion of putting a regular brooder lamp over them this can amplify the fungal or bacterial growth that has already found its way in. Intead use a white light 100 or 75 watts. Unless they have never been off the brooder then use the same wattage but use white light. Meaning if they are using a light that is fine just don't re-introduce one.
For day 1 dissolve one 325mg asprin in their water to help relieve their stress. Days 2&3 mix 4tsp RAW apple cider vinegar into their water, add some sweetener (1tbsp) I use agave necter but you could use sugar or honey. The tannin in the vinegar helps expell the mucus in the sinus and intestines and helps them absorb their nutrients more readily. The sugar just makes the water taste better thus helping them drink more. It also gives them a little energy. This mix makes one gallon you can save it for 2-3 days if you need to. Clensing the intestines with the vinegar also helps any medications you may use be absorbed by the intestines.
Use their regular feed ( I use 20% chick starter fo sick birds) but add shredded carrots, and chopped apples,chopped spinach,ground garlic. Of course this would be harder for younger chicks or banty to eat so if they are real small you need to grind or chop it smaller. Chickens utilize vitimin A more for their immune system. They process it differently than humans and it is comparable to us using vitimin C and zinc to help cure a cold.
Give them about a week on this and monitor them closely for improvement or decline. If they do not get worse keep them on this until you feel comfortable letting them with the others.
If you notice decline you may want to resort to antimicrobial solutions. Depending on the sickness there are a few to choose from. For respiratoy illness (CRD,MG,MS) there are several choices. Erythromycin,Tylosin,Tetramycin,Duramycin,Sulfanimides and Sulmet are cheaper often work well and all are added to the water. (fresh water not the mix from earlier) One tablespoon to one gallon for most but read the packet. You must change it daily so only make what you are going to use in 24 hours. A few of them can be given by injection directly to the sick bird.
There are also stronger ones, spinctomycin lincomycin that you can get but they are more costly.
Of all the mentioned antibiotics above I have used duramycin,sulmet, and tetramycin. I believe the sulmet works faster but is even more effective after using the clensing mix made with the vinegar. This year I have only seen illness in a big batch of silkie chicks my uncle has. I used the clensing mix along with the above diet and they recoverd nicely. Out of the 32 chicks we did lose 4 but the rest are all fine and growing fast now.
Also, after a round of antibiotics I give my birds kefir to help replace thier healthy intestinal bacteria.
Ahhh sorry if this seems like obsessive rambling...I am off to build another coop