Niels Pedersen DVM, professor at UC-Davis School of Veterinary Medicine wrote a well respected book that covers all aspects of managing feline health in catteries. That book is Feline Husbandry: Diseases and Management in the Multiple-Cat Environment (1991. American Veterinary Publications).
He talks about how overcrowding and poor husbandry in catteries can lead to infectious diseases, behavioral issues and nutritional problems - all of which can be avoided by breeders learning proper ways to raise cats for their optimal health.
This out of print book is always in demand but hard to find. In response, UC-Davis' Center for Companion Animal Health, which Pedersen directs, is offering a digital version of the 447-page book for free.
New and experienced cat breeders are invited to download a complimentary copy of Feline Husbandry at www.vetmed.ucdavis.edu/ccah/felinehusbandry.cfm