Table 1. Homozygous STOCK Crybb2^Phil mice are subfertile.

	Cryhh2+M x Crybb2+F	Crybh2PhilM x CrybbfPhilF
Mean Litter Size (# of pups)	1 1.6±3.2	7.9±4.0
# of Litters	41	22
Mean Fecundity (pups/30days)	9.2±4.8	4.6±3.6
# of matings	19	15
# of sterile matings	1 (5%)	3 (20%)
# of matings producing only one litter	3(16%)	7 (47%)

Crybb2⁺ M x Crybb2⁺ F versus Crybb2^Phil M x Crybb2^Phil F: Litter size p value=0.0002 Fecundity p value=0.0046.