perchie.girl
RIP 1953-2021
Quote:
Two very different answers. Biodiversity is both a function of time scale and how often you import new alleles into flock. With totally closed flock without occasional imports and time is indefinite, then hundreds of actual breeding birds needed which is not practical. If your flock is part of a local landrace where exchanges of breeders is relatively frequent between chicken keepers, like in truelly olden days when many of the less refined breeds where developed and used over the millenia, then minimum size for food and fiber kicks in. That is a function of your protein and / or energy needs met by consumption of poultry products. Then you need to figure how many birds and eggs do you consume annually? Then you need to consider how many breeder hens and roosters are needed to supply said products plus replace themselves before they are retired or lost (predators, disease, trade). You will be limited by productivity of your landscape and availabilty of feeds and feedstuffs needed to supplement the landscapes ability to meet the flocks nutritional needs. Their is also the issue of seasonality of production and its vulnerabilty to natural disasters (i.e. drought). Lots feed into this and is reason chickens on farmsteads generally supply only a small portion of old time farmers nutrition. Chicken on scale we enjoy today is a very recent event.
so then I should plan on not being able to keep a sustainable closed flock. Bring in new bloodlines every couple of years to ""freshen up the flock"" And assume I will need to feed em all. then play it by ear when they start free ranging and check on their condition periodically to see if they are keeping up on their weight. Probably at processing time. Lots to think about.....
Two very different answers. Biodiversity is both a function of time scale and how often you import new alleles into flock. With totally closed flock without occasional imports and time is indefinite, then hundreds of actual breeding birds needed which is not practical. If your flock is part of a local landrace where exchanges of breeders is relatively frequent between chicken keepers, like in truelly olden days when many of the less refined breeds where developed and used over the millenia, then minimum size for food and fiber kicks in. That is a function of your protein and / or energy needs met by consumption of poultry products. Then you need to figure how many birds and eggs do you consume annually? Then you need to consider how many breeder hens and roosters are needed to supply said products plus replace themselves before they are retired or lost (predators, disease, trade). You will be limited by productivity of your landscape and availabilty of feeds and feedstuffs needed to supplement the landscapes ability to meet the flocks nutritional needs. Their is also the issue of seasonality of production and its vulnerabilty to natural disasters (i.e. drought). Lots feed into this and is reason chickens on farmsteads generally supply only a small portion of old time farmers nutrition. Chicken on scale we enjoy today is a very recent event.
so then I should plan on not being able to keep a sustainable closed flock. Bring in new bloodlines every couple of years to ""freshen up the flock"" And assume I will need to feed em all. then play it by ear when they start free ranging and check on their condition periodically to see if they are keeping up on their weight. Probably at processing time. Lots to think about.....