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Vol. 44. Issue 12.
Pages 530-536 (January 2001)
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Vol. 44. Issue 12.
Pages 530-536 (January 2001)
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Influencia de la edad y el número de hijos previos de la madre en la proporción de sexos al nacer
Influence of mother's age and number of previous children in the sex ratio at birth
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F. Braza
Corresponding author
braza@ebd.csic.es

Correspondencia: Estación Biológica Doñana. CSIC.Apartado 1056. 41080 Sevilla
, J. Vico, A. León
Estación Biológica de Doñana. CSIC. Sevilla.Hospital Santa María del Puerto. El Puerto de Santa María. Cádiz
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Resumen

El objetivo de este estudio es examinar los efectos de la edad y del número de hijos previos de la madre en las variaciones de la proporción de sexos al nacer con idea de comprobar el modelo de Trivers y Willard que predice que, dependiendo de la condición de la madre, puede haber un sesgo en la proporción de sexos entre los recién nacidos. La muestra de estudio estaba compuesta por 6.994 madres de Granada de 20 a 34 años de edad, que tuvieron de forma natural un solo hijo, con más de 35 semanas de gestación. Los resultados revelan la existencia de una contribución significativa del número de hijos previos de la madre en la proporción de sexos al nacer. Si consideramos además que, en la franja de edad considerada, las condiciones fisiológicas del útero mejoran con el número de embarazos, podríamos decir que las madres de la muestra de estudio siguen las predicciones del modelo de Trivers y Willard

Palabras clave:
Edad de la madre
Hijos previos
Proporción de sexos
Madres andaluzas
Abstract

The aim of this paper is to study the effects of the age and the number of previous children of the mother on the variations in the sex ratio at birth, in order to test Trivers and Willard's model which predicts that, depending on the mother's condition, there can be a biased in the sex ratio at birth. The study sample was made up of 6,994 mothers from Granada (Spain) aged from 20 to 34 who had only one child by non-assisted reproduction, and with more than 35 weeks of gestation. The results show that a significant relationship exists between the number of previous children of the mother and the sex ratio at birth. Moreover, considering that the condition of the uterus improves with the number of pregnancies, within the study range of ages, we could say that variation in the sex ratio at birth, within this study sample, follows the prediction of Trivers and Willard's model

Keywords:
Mother's age
Previous children
Sex ratio
Andalousian mothers
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