Table 2.

Weight group analysis

Strain	Group	n	Mean no. of oocytes / female mouse (± SE)	Mean no. of fertilized oocytes/ female mouse (± SE)	% of oocytes fertilized
C57BL/6NHsd	1	20	37.7	24.3	65
	2	20	37.0	23.5	63
	3	20	31.4	21.0	67
	4	20	24.6	16.6	67
B6(Cg)-Tyrc-2J/J	1	27	12.3	7.2	58
	2	20	32.0	14.0	44
	3	17	22.2	8.5	38
	4	19	19.8	8.9	45
FVB/NHsd	1	32	10.1	7.3	53
	2	25	10.5	8.4	80
	3	25	12.5	10.8	86
	4	25	14.4	10.3	71
B6D2F1/Hsd	1	8	30.6	25.4	83
	2	8	21.0	16.1	77
	3	15	16.8	13.7	82
	4	8	24.0	16.5	69
Crl:CD1(ICR)	1	28	16.1	12.8	80
	2	19	13.6	11.7	86
	3	20	10.8	7.8	73
	4	19	23.3	19.3	83
BALB/cAnNCr	1	18	39.0 (6.9)	20.9 (3.1)	59
	2	25	47.8 (3.0)	19.0 (2.9)	41
	3	16	7.9 (1.3)	3.1 (0.7)	36
	4	16	10.5 (1.4)	3.9 (0.8)	32

< 0.001) more oocytes than did groups 3 and 4, of which significantly (P < 0.001) more were fertilized.