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The influence of maternal rank and infant sex on maternal investment trends in rhesus macaques: birth sex ratios, inter-birth intervals and suckling patterns

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In the new colony of rhesus macaques at Madingley, no overall difference was found in the length of the inter-birth intervals following the birth of male and female infants. The lack of overall differences in the reproductive costs of raising sons and daughters, was associated with an absence of differences in suckling patterns between male and female infants. It is argued that similar pre-weaning investment in sons and daughters may be related to the presence of similar growth rates for male and female infants during the first year of life. Most high ranking mothers reproduced in consecutive years, while low ranking mothers were more likely to experience two year long inter-birth intervals. Further analyses revealed that this difference was mainly due to the fact that low ranking mothers always failed to reproduce the year after raising a daughter. Thus, no difference was found in the length of inter-birth intervals between high ranking mothers with infants of either sex and low ranking mothers with sons. The daughters of low ranking females suckled more frequently and making more nipple contacts per bout, and such high nipple stimulation was responsible for the reproductive inhibition experienced by their mothers. It is suggested that the high degrees of nipple stimulation may have been a consequence of the high levels of aggression that low ranking females with daughters have been shown to receive, since their mothers could have allowed frequent ventro-ventral contact in order to protect them. Given that low ranking mothers find daughters reproductively costly to raise, it is possible that such high reproductive costs have played a significant role in the evolution of sex ratio biases at birth. As in other primate populations, in this colony low ranking females produced a greater proportion of sons than daughters, and high ranking mothers showed the opposite trend.

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Gomendio, M. The influence of maternal rank and infant sex on maternal investment trends in rhesus macaques: birth sex ratios, inter-birth intervals and suckling patterns. Behav Ecol Sociobiol 27, 365–375 (1990). https://doi.org/10.1007/BF00164008

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