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Table 1.

A summary of age-dependent responses of hatching and HSP expression to increasing thermal loads in 12- and 18-day-old Lohmann, Hy Line and Bedouin fowl embryos of different ages

Ta=42°C
Ta=43°C
Ta=44°C
Hatching*HSP responseHatching*HSP responseHatching*HSP response
Exposure length 6 h 8h 6 h 8 h 6 h 8 h 6 h 8 h 6 h 6 h 
Embryonic age           
    12 days nr nr ↑ ↑ nr 
    18 days ↑ nr ↑ nr nr 
Ta=42°C
Ta=43°C
Ta=44°C
Hatching*HSP responseHatching*HSP responseHatching*HSP response
Exposure length 6 h 8h 6 h 8 h 6 h 8 h 6 h 8 h 6 h 6 h 
Embryonic age           
    12 days nr nr ↑ ↑ nr 
    18 days ↑ nr ↑ nr nr 

Ta, ambient temperature.

*

+, hatching; -, reduced hatching.

↑, increased response; nr, no response.

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