Timing matters: corticosterone injections 4 h before ovulation bias sex ratios towards females in chickens

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Sara E PinsonKristen J Navara

Abstract

Birds have the ability to influence offspring sex prior to egg laying and may use hormones to mediate these skews. Corticosterone is of particular interest as a mediator of offspring sex because, as the primary stress hormone in birds, it regulates responses to environmental and social stimuli that trigger sex ratio biases. In previous studies in birds, chronic elevations of corticosterone stimulated female-biased sex ratios while acute pharmacological elevations that were provided 5 h prior to the expected time of ovulation stimulated male-biased sex ratios. Here, we aimed to determine the magnitude of corticosterone necessary to influence offspring sex and to further pinpoint the timing of the hormonal influence. Because high-dose injections of corticosterone stimulated male-biased sex ratios in hens, we hypothesized that females receiving acute pharmacological elevations of corticosterone would produce more male offspring while females with acute physiological elevations would produce an intermediate proportion of males compared to controls. We tested our hypotheses in laying hens by elevating corticosterone in the physiological or pharmacological range through injections of corticosterone administered 4 or 5 h prior to the ...Continue Reading

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Citations

Apr 16, 2020·Frontiers in Veterinary Science·Mariana R L V PeixotoTina M Widowski
Apr 7, 2019·Trends in Ecology & Evolution·Benjamin Geffroy, Mathieu Douhard

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