Abstract
In this paper we demonstrate that maternal investment per offspring is a major component of demographic tactics in placental mammals. Maternal investment is determined in the first days of life through prenatal growth rate (estimated by the neonatal weight divided by gestation period), and instantaneous growth rate shortly after birth. Once the phylogeny inertia is accounted for and the effect of maternal size is removed, both growth rates are higher in species which disperse their lifetime reproductive effort, i.e. closer to iteroparity, than in species which concentrate their lifetime reproductive effort, i.e. closer to semelparity. We find no evidence for a trade-off between prenatal and neonatal maternal investments
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