Table 1.

Litter size and embryo size in formate-supplemented curly tail mice.

Formate conc.	0 mg/ml	20 mg/ml	0 mg/ml	30 mg/ml
No. Litters	15	10	13	14
Mean litter size	6.90 ± 0.50	9.00 ± 0.90*	7.00 ± 0.60	9.57 ± 0.40**
Mean crown-rump length (mm) (n)	7.78 ± 0.14 (25)	7.683 ± 0.04 (90)	7.88 ± 0.07 (47)	7.78 ± 0.03 (133)

Mean litter size of dams supplemented with 20 mg/ml or 30 mg/ml formate was larger than in control groups (*p < 0.05, **p < 0.01). The crown-rump length of embryos at E12.5 did not differ among experimental groups.