Here's some info I recently came across:
The Family Poultry Flock Edited by Lee Schwanz A Farmer's Digest Publication
Quick guide to productive hens
Layers and nonlayers
Character Layer Nonlayer
Comb..........................Large, smooth, bright red, glossy..........Dull, dry, shriveled, scaly.
Face...........................Bright red.........................................Yellowish tint.
Vent...........................Large, smooth, moist..........................Shrunken, puckered, dry
Pubic bones.................Thin, pliable, spread apart....................Blunt, rigid, close together.
Abdomen.....................Full, soft, pliable.................................Contracted, hard, fleshy
Skin...........................Soft, loose.........................................Thick, underlaid with fat.
High and low producers
Character High producer Low producer
(continuous laying) (brief laying)
Vent..............Bluish white..........................Yellow or flesh color.
Eye ring..........White..................................Yellow.
Ear lobe..........White..................................Yellow.
Beak...............White.................................Yellow.
Shanks............White, flattened...................Yellow, round.
Plumage..........Worn, soiled.........................Not much worn.
Moting............Late, rapid...........................Early, slow
A Guide To Raising Chickens by Gail Damerow
Culling Checklist
Body Part Good Layer Poor Layer
Carriage........................active and alert.......................lazy and listless
Eyes.............................bright and Sparkling.................dull and sunken
Comb and wattles...........large and bright......................small and pale
Shanks.........................thin and flat...........................round and full
Back.............................wide.....................................narrow or tapered
Abdomen.......................deep and soft.........................shallow and hard
Pubic bones*.................wide apart and flexible.............tight and stiff
Vent*...........................large and moist......................puckered and dry
Plumage........................warn, dry, and dirty................smooth, shiny, clean
Molt.............................late......................................early
Skin.............................bleached................................yellow
* Most reliable indicators.
The Family Poultry Flock Edited by Lee Schwanz A Farmer's Digest Publication
Quick guide to productive hens
Layers and nonlayers
Character Layer Nonlayer
Comb..........................Large, smooth, bright red, glossy..........Dull, dry, shriveled, scaly.
Face...........................Bright red.........................................Yellowish tint.
Vent...........................Large, smooth, moist..........................Shrunken, puckered, dry
Pubic bones.................Thin, pliable, spread apart....................Blunt, rigid, close together.
Abdomen.....................Full, soft, pliable.................................Contracted, hard, fleshy
Skin...........................Soft, loose.........................................Thick, underlaid with fat.
High and low producers
Character High producer Low producer
(continuous laying) (brief laying)
Vent..............Bluish white..........................Yellow or flesh color.
Eye ring..........White..................................Yellow.
Ear lobe..........White..................................Yellow.
Beak...............White.................................Yellow.
Shanks............White, flattened...................Yellow, round.
Plumage..........Worn, soiled.........................Not much worn.
Moting............Late, rapid...........................Early, slow
A Guide To Raising Chickens by Gail Damerow
Culling Checklist
Body Part Good Layer Poor Layer
Carriage........................active and alert.......................lazy and listless
Eyes.............................bright and Sparkling.................dull and sunken
Comb and wattles...........large and bright......................small and pale
Shanks.........................thin and flat...........................round and full
Back.............................wide.....................................narrow or tapered
Abdomen.......................deep and soft.........................shallow and hard
Pubic bones*.................wide apart and flexible.............tight and stiff
Vent*...........................large and moist......................puckered and dry
Plumage........................warn, dry, and dirty................smooth, shiny, clean
Molt.............................late......................................early
Skin.............................bleached................................yellow
* Most reliable indicators.