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The effect of flock age, preincubation heat treatment, and turning during 14-day storage on the hatchability of fertile eggs. 1Flock age (FA): young = 29 wk, old = 58 wk. 2Preincubation heat treatment (PHT): control = not heated during storage, SPIDES = heated over 32°C EST for 3.5 h and remained at 35°C for 2.5 h on day 5 after egg collection, and combined = control and SPIDES treatments. Turning treatment: 0 or 4 times/day turning during the storage period.
