1. Fujita M, Roth E, Lo YJ, Hurst C, Vollner J, Kendell A. (2012) In poor families, mothers’ milk is richer for daughters than sons: A test of Trivers-Willard hypothesis in agropastoral settlements in Northern Kenya. Am J Phys Anthropol. 149:52-59.

2. Gallego L, Gómez JA, Landete-Castillejos T, Garcia AJ, Estevez JA, Ceacero F, Piñeiro V, Casabiell X, de la Cruz LF. (2009) Effect of milk minerals on calf gains and sex differences in mineral composition of milk from Iberian red deer (Cervus elaphus hispanicus). Reproduction. 138:859-65.

3. Hinde K. (2009) Richer milk for sons but more milk for daughters: sex biased investment during lactation varies with maternal life history in rhesus macaques. Am J Hum Biol. 21:512-519.

4. Hinde K. (2007) First-time macaque mothers bias milk composition in favor of sons. Curr Biol. 17:R958-R959.

5. Koskela E, Mappes T, Niskanen T, Rutkowska J. (2009) Maternal investment in relation to sex ratio and offspring number in a small mammal – a case for Trivers and Willard theory? J Anim Ecol. 78: 1007–1014.

6. Landete-Castillejos T, Garcia AJ, López-Serrano FR, Gallego L. (2005) Maternal quality and differences in milk production and composition for male and female Iberian red deer calves (Cervus elaphus hispanicus). Behav Ecol Sociobiol. 57:267-274.

7. Lunn NJ, Arnould JPY. (1997) Maternal investment in Antarctic fur seals: evidence for equality in the sexes? Behav Ecol Sociobiol. 40: 351-362.

8. Oftedal, O. T. & Iverson, S. J. (1995) Phylogenetic variation in the gross composition of milks. In Handbook of milk composition, (ed. R. G.Jensen), pp. 749–789. Academic Press, New York.

9. Ono KA & Boness DJ. (1996) Sexual dimorphism in sea lion pups: differential maternal investment, or sex-specific differences in energy allocation? Behav Ecol Sociobiol. 38:31-41.

10. Powe CE, Knott CD, Conklin-Brittain N. (2010) Infant sex predicts breast milk energy content. Am J Hum Biol. 22:50-4.

 

Contributed by

Prof. Katie Hinde
Human Evolutionary Biology
Harvard University