Table 1.

Source of females paired with males and distribution of pup births and infertile pairs. There was no effect of stress or source of female on reproduction for the first or second litter.

Male group	Female Source	First litter		Second litter
		Had pups	No pups	Had pups	No pups
Control	Stock Center	4	3	2	2
	Colony	6	2	4	2
	Total	10	5	6	4
Stress	Stock Center	6	1	6	0
	Colony	5	2	4	1
	Total	11	3	10	1
	Total	21	8	16	5