Here you go...
It is relatively easy to determine whether or not a hen is in production. Check the condition of the comb, pubic bones, abdomen, and vent. If a hen is laying, her comb and wattles should be large, red, soft, and waxy; the pubic bones should be flexible and wide apart; the abdomen should be full, soft, and pliable; and the vent should be large, moist, and free of pigment. A good layer should have more than two fingers spread between the pubic bones and three or more fingers spread between the pubic bones and the tip of the keel.
When a hen is out of production, her comb and wattles may be small, pale, and shriveled; the pubic bones are rigid and close together; the abdomen is hard and tight; and the vent is small, dry, and pigmented. Do not confuse a fatty abdomen with one that is soft and pliable due to laying condition.