[f. LAY v.1 + -ING2.] That lays: chiefly said of hens.
1591. Percivall, Sp. Dict., Ponedera gallina, a laying hen.
1884. E. P. Roe, Nat. Ser. Story, ii. in Harpers Mag., Jan., 288/2. I can keep my laying hens warm even in zero weather.