Maybe that's why folks are reporting such high losses per year? They are just letting their birds die of old age, predation, and illness. That isn't a managed flock, that's just a flock that's being fed and watered. Flock management denotes that one actually
manages something.
Think of the waste of keeping birds until they are old enough to just die from old age. That bird should have been a cull and in the freezer...no waste. Think of the waste of letting predators pick off flocks because someone hasn't provided adequate measures to prevent it...this falls under "management". Some predation cannot be managed but most can...better than most can.
I've been in this a long time and kept birds in the middle of pasture, woodland(like now) and in the middle of town....never had a bird "run away". Usually a bird will not get far from the flock and if they do it's to brood a nest. If they didn't come back, they got eaten. They don't just fly off to join a hippy commune and write songs..they are a flock animal. Never lost a bird in that manner either. That's why I advise to cull lonely hearts and loners...they get picked off first. Do I want to eat that meat or do I want to just let the foxes have it?
Four birds dropping off the nest in one year from the same genetics/hatchery and of the same malady? That's a genetic fault of organ failure. Never happened before, never again...just that one year and all birds were just over a year old. This is why we cull for genetic traits and hardiness in the hens we keep to bear replacement hens...if I had a bird that had a genetic flaw, would I just go ahead and brood those eggs? No...because I am managing my flock instead of just throwing down feed and hoping everyone stays alive and well.
There are certain things experienced flock keepers do to lessen losses and that falls under management. We don't do these things to hear our heads rattle, we do them all for a reason....so we don't lose 10 birds a year that didn't wind up in our freezers. Being successful at raising chickens takes thought and planning and then it takes positive action. When a person does none of these things, is it any wonder they aren't successful?
I don't replace all my hens every year...if they are good layers and have the traits I want, I keep them for as long as possible. My last flock was 18 mo. old, 5,6, and 7 yr olds. I currently have a remnant of that same flock in my coop tonight and they are 6 yrs old and some are almost 3 yrs old. If they resume laying after winter slow down, I will continue to feed them unless I see signs of too old age, then they will be culled for the freezer....before they die of old age and are wasted.