title: RELATION BETWEEN BIRTH WEIGHT AND LITTER SIZE IN MULTIPAROUS MAMMALS.
abstract: In multiparous mammals there is a definite relation between the litter size N and the total weight of the litter W. Reasons are given showing that this relationship is independent of the mechanism of parturition. For various forms W = N(K) + const. Hence the average increment of W due to unit increase of N is directly proportional to W, inversely to N. This signifies proportionality between N and nutritive drain upon the mother, as well as equipartition among the members of the litter. K is non-specific, and is therefore regarded as a partition index.
authors.affiliation: Laboratory of General Physiology, Harvard University, Cambridge.
authors.forename: E V
authors.initials: EV
authors.lastname: Enzmann
authors.forename: W J
authors.initials: WJ
authors.lastname: Crozier