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actually it's the "more light" that is the key there...
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that is true of egg binding. where an egg fails to pass properly. this bird was not egg bound technichally, she was prolapsed. there's a difference.
egg bound hens are typically trying to pass eggs with little or no shell laid down (called leather eggs by some), so the contractions to pass the egg are ineffective, and the egg essentially gets stuck. yes some hens do lay 'leather eggs' successfully but it requires a lot more work on the hen's part and some birds just aren't up to it. so by increasing the calcium content of their diet, they are able to lay better shells on their eggs, and thus pass them through without problems.
a prolapse, whether from injury or genetics or who-knows-what, the eggs this bird tried to pass got wrapped in a fold of tissue, and when she tried to expel it, more tissue came out with it, causing the problems she had. prolapse could be because of a "design flaw" where she has an extra fold of tissue that catches the eggs, or simply a matter of chance, or that the egg may have been drier than it should have been and tissue stuck to the shell causing the prolapse.
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day length controls a lot of things, not just in chickens. like animals growing longer coats for the winter, shedding in the spring, heat cycles, and the list goes on. in the event that the animal is unable to determine day length (signals sent from the eyes to the brain), then surrounding temperature will send the same signals, but the effect is delayed. day length starts shortenning after June 21st, but it isn't until September or October that the days start getting cooler (and we notice them 'fuzzing up'). so if they have to wait to receive the signals in september or october, then they won't actually start fuzzing until december or january... I have a horse that's been blind for 12 years, and these are some things that she's proven to us year after year... she finally has a winter coat by january, and starts shedding in june or july.
so by decreasing a hen's day length to 6 hours or less, that's telling her that it's winter and conditions are not conducive to starting a family... and increasing their day length will encourage them to lay longer into the winter.
so feeding a layer diet does not automatically mean the hen will lay eggs... day length is a much stronger contributor to that, or you would see a lot more roosters laying eggs IMO.
WOW thanks for all that enlighting information. glad you posted all that!