Chickens in permaculture systems are kept for various functions: egg production, meat production, pest control, heat generation, manure production, animal tractors,...
Different breeds of chicken are better at one or another of these functions. Mainly one can distinguish layers for egg production and broilers for meat production.
Some breeds forage more intensively than others and can obtain a large portion of their food from this, reducing food costs.
Kathleen Sanderson wrote: Saskia, somewhere I have a copy of Dave Holderread's book on ducks, but it's packed --