Table 1.

Comparison of the developmental stages of Japanese quail, chick and bobwhite quail embryos.

HH stage	Japanese quail	Chick (Hamburger & Hamilton, 1951)	Bobwhite quail (Hendrickx & Hanzlik, 1965)	Japanese quail (Sellier et al. 2006)
4	18–19 h	18–19 h		18 h
5	19–22 h	19–22 h
6	23–25 h	23–25 h		24 h
7	23–26 h	23–26 h
8	26–29 h	26–29 h
9	29–33 h	29–33 h		30 h
10	33–38 h	33–38 h
11	40–45 h	40–45 h
12	45–49 h	45–49 h		36 h
13	48–52 h	48–52 h		42 h
14	50–53 h	50–53 h		48 h
15	50–55 h	50–55 h		54 h
16	51–56 h	51–56 h
17	52–64 h	52–64 h		60–66 h
18	72 h	72 h
19	3 days	3–3.5 days		72 h
20	3.5 days	3–3.5 days
21	3.5 days	3.5 days
22	4 days	3.5–4 days
23	4 days	4 days
24	4 days	4 days	5 days
25	4.5 days	4.5 days	6 days
26	4.5–5 days	4.5–5 days	7 days
27	5 days	5 days	8 days
28	5.5 days	5.5 days	9 days
29	5.5–6 days	6 days	10 days
30	6–6.5 days	6.5 days	11 days
31	6.5 days	7 days	12 days
32	7 days	7.5 days	13 days
33	7 days	7.5–8 days	14 days
34	7.5 days	8 days	15 days
35	8–8.5 days	8–9 days	16 days
36	8–9 days	10 days	17 days
37	9.5 days	11 days	18 days
38	9.5–10 days	12 days	19 days
39	10.5–11 days	13 days	20 days
40	11 days	14 days	21–22 days
41	11.5 days	15 days	23 days (hatching)
42	12–13 days	16 days
43	14 days	17 days
44	15–16 days	18 days
45	16–16.5 days	19–20 days
46	16.5 days (hatching)	20–21 days (hatching)

All stages are presented as time of incubation.