Two experimentswere carried out to estimate sodium requirements for brown-eggs laying hensin the late first and during second egg-production cycle. A completely randomizeddesign was used, with seven sodium levels (0.08, 0.13, 0.18, 0.23, 0.28, 0.33and 0.38%), six replications of six birds in the late first egg-production cycleand five replications of six birds in the second egg-production cycle. In thelate first egg-production cycle, sodium levels (SL) had no effect on feed intake(FI), egg weight (EW), egg dozen feed conversion (EDC) and egg-shellspecific gravity (SG). The SL showed quadratic effect on egg production (EP),egg mass (EM) and egg mass feed conversion (EMC), that resulting in sodium requirements(SR) of 0.21, 0.22 and 0.21%, respectively. In the second egg-production cycle,SL had no effect on EW and SG. However, EP, EM, EMC and EDC improved when thelevels of sodium were 0.20, 0.19, 0.18 and 0.19%, respectively. Consideringthe estimates of sodium requirements to egg production and egg mass feed conversion,could be suggests 0.22% e 0.20% as maximum sodium levels, respectively, to latefirst and second egg-production cycle.
