Abstract

This study explores the hypothesis that the intrinsic pattern for non-human mammalian birth intervals is based on a relationship between the physical development of the offspring and the reproductive process of the mother. Specifically, it examines the relationship between the suckling and teething patterns of non-human mammalian offspring and the lactating and ovulating pattern of the mother as related to the birth interval. Species in the sample are selected to represent differentiating mammalian gestation and ingestion characteristics. Their data are plotted on parallel timelines and correlations are identified. Findings provide evidence that there is a positive relationship between the eruption of the permanent molars and the birth interval, that offspring suckle through the beginning of molar eruption, and that offspring continue to suckle until their locomotor development enables them to acquire their own nutrients. Furthermore, it was found that ovulatory patterns and the timing of gestational events are a function of econiche latitude, and that the beginning of environmental nutrient ingestion is dependent on the presence of cheek teeth, oral muscular development, and locomotor ability. If the findings are applicable to the human reproductive process, they may provide practical information regarding the duration of the lactation period, the appropriate time for the introduction of environmental nutrients, and the intrinsic birth interval of the species.

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