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At a theoretical level, the Trivers-Willard Sex Ratio Hypothesis applies toboth avian species and mammals. This article, however, conjectures that at thestatistical level, sex ratio effects are likely to produce sharper numericalvariations among birds than among mammals. We explain this greater statisticalvariation should likely have beneficial implications for increasing theefficiency of world-wide poultry egg (and perhaps also meat) production.

Implications of the Trivers-Willard Sex Ratio Hypothesis for Avian  Species and Poultry Production, And a Summary of the Historic Context of this  Research