Edited by DAFox - 6/20/10 at 3:35am. I would say that you have probably 9 or so more weeks to go before adding the babies. Put them next to your existing flock separated by fence. The chicks and the chickens should be close to the same size and it also depends on how many are in your existing flock.
1 Most often, the catheter is inserted through the urethra. This is the tube that carries urine from the bladder to the outside of the body.  Sometimes, the provider will insert a catheter into your bladder through a small hole in your belly. This is done at a hospital or provider's office.
This test requires a urine sample. The sample is taken by placing a thin rubber tube (called a catheter) through the urethra into the bladder. A nurse or a trained technician may do this. First, the area around the opening of the urethra is thoroughly washed with a germ-killing (antiseptic) solution. The tube is inserted into the urethra. The urine drains into a sterile container, and the catheter is removed.