Table 1.

Fertility Indices in ATR1

ART1 fertility indices
	F0 generation			F1 generation			F2 generation
	Control	50 ppm	100 ppm	Control	50 ppm	100 ppm	Control	50 ppm	100 ppm
First mating
No. of females cohabitated	20	20	20	20	20	20	20	19	20
No. of pregnant females	19	18	18	18	18	14	15	17	18
Female fertility index (%)a	95	90	90	90	90	70	75	89	90
No. of males cohabitated	10	10	10	10	10	10	10	10	10
No. of males siring at least one litter	10	10	10	10	10	8	9	10	10
No. of males siring only one litter	1	2	2	2	2	2	3	2c	2
Male fertility index (%)b	100	100	100	100	100	80	90	100	100
Second mating
No. of females cohabitated	20	20	20	20	20	20	20	19	20
No. of pregnant females	18	15	16	16	17	16	16	17	20
Female fertility index (%)a	90	75	80	80	85	80	80	89	100
No. of males cohabitated	10	10	10	10	10	10	10	10	10
No. of males siring at least one litter	10	9	9	9	10	9	9	10	10
No. of males siring only one litter	2	3	2	2	3	2	3	2c	0
Male fertility index (%)b	100	90	90	90	100	90	100	100	100

^aFemale fertility index = (no. of females cohabitated/no. of females pregnant) × 100.

^bMale fertility index = (no. of males cohabitated/no. of males siring at least one litter) × 100.

^cExcludes one male that was only cohabitated with a single female.