The Company of Biologists

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

	T_a=42°C							T_a=43°C
	Hatching^*			HSP response^{^†}			Hatching^*			HSP response^{^†}	Hatching^*	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

	T_a=42°C							T_a=43°C
	Hatching^*			HSP response^{^†}			Hatching^*			HSP response^{^†}	Hatching^*	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

T_a, ambient temperature.

+, hatching; -, reduced hatching.

†

↑, increased response; nr, no response.

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