@njmugo in deep litter system it is a requirement that litter is changed periodically as occasions demand to prevent infectious diseases from building up including parasite infestations.
Litter should be raked thoroughly at frequent intervals, say at least twice a week.depending on the material used it could even take 2 months or more before the need to change it. You will need to keep an eye out for leaks and spills so that the bedding doesn’t become overly wet, keep a close eye around your drinkers.
While your chickens will do most of the turning for you, inspect your coop floor on a regular basis to make sure the entire litter system is aerated. You will want to make sure your chickens haven’t missed any spots.
If any sections of the litter begin to look white or ashen, they are oxygen-deprived. Make sure you break these up and turn them as soon as possible.
You will also need to keep a close eye on the moisture content of your bedding. It should be equally moist and consistent without any lumps. If you pick up the litter and squeeze it, it should not release any water. It should hold its shape and then crumble. Turning your litter can help distribute moisture evenly around the coop.
Please note: If you have any outbreak of a disease in your flock, of any kind, be it parasites or a bacterial or viral illness – make sure you remove all of the deep litter. It’s time to clean it out, sanitize your coop, and start all over. It can be frustrating, however, it’s essential to prevent the disease from spreading among your flock.