Early posthatch body temperature, haematology and growth performance in Transylvanian naked neck chicks hatched from eggs stored for different durations

Early posthatch physiological responses and growth performances were assessed in 80 chicks hatched from Transylvanian naked neck (TN) chicken eggs stored in a cold room for 0, 3, 6, 9, and 12d before incubation with four replicates per group. The rectal temperature (RT) of birds hatched from 0 and 3d stored eggs were significantly (P < 0.01) lower than in the 9–12d storage groups. There was (P < 0.001) an increase in skin temperature on the breast (STB) as the length of storage increased. Day-old chicks and 28d-old chickens from non-stored eggs had higher (P < 0.05) packed cell volume (PCV) and haemoglobin (Hb) concentration than eggs stored for 12d. Chickens in 0, 3 and 6d storage groups had (P < 0.01) higher platelet count values than in the 12d group. During d1-28, chicks from 0 to 6d egg storage had (P < 0.001) higher weight gain and final live weight than 9–12d storage. Feed consumption was (P < 0.01) lower in 3d than in 6–12d. Chicks from 0 to 6d storage recorded a lower (P < 0.001) feed conversion ratio than in 9–12d storage. In conclusion, prolonged storage of TN eggs resulted in higher RT and STB, lower PCV and Hb, and lower growth performance during early posthatch age.