Table 1.

Embryos collected at different stages from 111 females after effective copulation

Time post copulation	Numbers of embryos at different stages (n)					Numbers of females (n)
	1-cell stage	2-cell stage	4-cell stage	6-cell stage	Blastula
22-28 h	211	7	2	0	0	79
29-34 h	25	21	9	0	0	21
41-46 h	0	0	0	3	0	1
47-50 h	2	0	12	0	0	5
60-64 h	2	0	0	0	3	2
69-75 h	0	0	0	6	4	3