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The relationship of hatchability with thermal manipulation (TM) during incubation. The blue line indicates normal incubation conditions while the red line indicates TM during incubation. The hatchability was reduced when TM was done during early incubation (Narinç et al., 2016) or done twice during the incubation period (Collin et al., 2007). Long-term continuous TM also resulted in decreasing hatchability (Piestun et al., 2008).
