Table 2.

Summary of Reproductive Data of SPF Colony Females and Age-Matched Conventional Colony Females

Parameter	SPF	Conventional
Sexually mature adult females	34	49
Average age at menarche (years)	3.27 ± SE 0.10	N/A
Adult females removed from colony	11	0
Females that conceived at least once	22	42
Average age at first conception (years)	4.22 ± SE 0.14	4.69 ± SE 0.09
Total pregnancies	62	113
Total live births	55* (90.2%)	102 (90.3%)
Total abortions	5 (8.1%)	4 (3.5%)
Total stillbirths	1 (1.6%)	7 (6.2%)
Total infant deaths before 180 days of age (Does not include abortions and stillbirths)	9 (16.4%)	10 (9.8%)
Total number of infants nursery-reared	7 (12.7%)	5 (4.9%)
Percentage (%) successful mother-reared infants	70.9%	79.2%
Percentage (%) male infants	51.8%	52.8%
Average PPA when infants were reared by their mother (days)	178 ± SE 9.9	205 ± SE 8.8
Total number of multiparous females	16 (72.3%)	30 (71.4%)
Average IBI of multiparous females (days)	413 ± SE 18	385 ± SE 14

^*One (1) conception in the SPF colony was later born within the conventional colony due to a break in SPF status by the pregnant female. This birth was therefore not included in the final live birth rate.