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. Author manuscript; available in PMC: 2016 Aug 19.
Published in final edited form as: Dev Dyn. 2015 Jul 2;244(9):1158–1167. doi: 10.1002/dvdy.24262

Table 2. Range of gestation time associated with each HH stage per species.

Duck embryos require a longer time to reach a given HH stage than chicks and quail.

Range of hours post conception associated with HH stage
Species (Gestation in days) HH22 HH23 HH24 HH25 HH26 HH27
Quail (16) 84–114 96–114 96–120 114–130 120–126 126–142
Chick (21) 84–96 96–108 108–120 108–156 108–156 144+
Duck (28) 120–138 120–156 144–168 144–174 162–174 174–186