At a proper dosage, one can reasonably expect to obtain 20 30 eggs per female mouse dependent on age and strain, in our experience, including B6SJL, C57BL 6 DBA 2 B6D2, and C57BL 6 C3H B6C3H hybrids; C57BL 6 or BL 10 and congenics, C3H or FVB inbreds; and outbred Swiss Swiss Webster, FVB, ICR, CD 1, and ND 4 viagra on empty stomach The challenge with these treatments is to maintain good adherence as they have GI adverse effects