The tendency of some mothers to coddle their sons may be ingrained, at least in species where males compete for mates.
A recent study of Iberian red deer on a research farm has shown that mothers produce more milk of higher growth-potential for a male calf than a female one. The reason appears to be a genetic advantage, seeing as healthier, stronger males will mate more often – spreading the mother’s genes.
see full article at
http://www.livescience.com/animalworld/050307_gender_milk.html
Evi Adams
Israel
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