Table 4. Staging Taiwan Country Chicken (TCC) and Brown Tsaiya Duck (BTD) embryos by the incubation time (h) relative to Hamburger and Hamilton (HH) and Dupuy (D-) staging system during the first 72 h of incubation.

		Hour (h) post-incubation
The HH stage	D-staging	HH	TCC	BTD
1	13–14	0–5	0–5	0–12
2	15	6–7	6–7	10–14
3	16	12–13	12–13	13–24
4	17	18–19	18–19	25–29
5	18	19–22	19–22	25–31
6	19	23–25	22–25	31–35
7	20	23–26	24–26	33–34
8	21	26–29	26–29	32–36
9	22	29–33	29–33	36–42
10	23	33–38	33–39	43–46
11	24	40–45	40–45	45–48
12	25	45–49	45–49	50–52
13	26	48–52	48–52	54–56
14	27	50–53	50–53	60–64
15	28	50–55	50–55	64–68
16	29	51–56	52–56	69–72
17	30	52–64	52–64	71–72
18	31	65–69	65–69	N/A
19	32	68–72	68–72	N/A

N/A: data not available.