![]() In the bottom, middle and top tiers, 5% age of yield was observed as 151, 146 and 156 days, respectively 50% age of yield was 162.4, 158.6 and 161.8 days 5% yield age bodyweight (BW) as 1597.8, 1460.2 g 50% yield age BW as 1708.7, 1666.7 g, respectively. Layers at the age of 18 weeks were randomly allocated to conventional three-tier battery cages with five replicates of six hens per treatment in a completely randomized design. The experiment was conducted on hens from the age of 18 weeks to 42 weeks. ![]() They were housed in three-tier conventional battery cages (bottom, middle and top) with 600 cm2/per bird. Ninety laying hens (hybrid ATAK-S) of similar bodyweights were used in the experiment. ![]() This study was conducted to investigate the effects of cage tier and age on performance characteristics of layer hybrids, egg quality and some stress parameters.
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