A screening method for anti-osteoporotics using ovariectomized rats was designed using a compact method to monitor the bone density. It was found that ovariectomy (OVX) of Wistar female rats (11 weeks old) induced acute and focal osteopenia within 2 weeks, which responded well to intermittent salmon calcitonin (SCT: 5 and 20 U/kg, s.c., every other day) employed as the standard anti-osteoporotic and injected up to 4 weeks with or without a delay of 2 weeks after OVX.