Offspring sex ratio in birds | Wild Turkey Science #618

We deep dive into the complex mechanisms of sex determination in birds, focusing on how environmental and physiological factors influence sex ratios.   Resources: Aslam, M. A., et al. (2014). Effect of corticosterone and hen body mass on primary sex ratio in laying hen (Gallus gallus), using unincubated eggs. Biology of Reproduction, 90(4). Curry, J., et al. (2023). Dietary fat supplements influence weight gain and egg production, but not offspring sex ratios in Japanese quail, Coturnix coturnix japonica. Journal of Avian Biology, 2023(5-6), e03081. Dorr, B. S., et al. (2014). Geographic segregation and evidence of density‐dependent changes in sex ratios in an abundant colonial waterbird. Integrative Zoology, 9(5), 570-582. Emam, A. M., et al. (2024). Is the sex ratio of Japanese quail offspring equal?. Tropical Animal Health and Production, 56(8), 384. Müller, W., et al. (2002). Sex differences in yolk hormones depend on maternal social status in Leghorn chickens (Gallus gallus domesticus). Proceedings of the Royal Society B: Biological Sciences, 269(1506), 2249. Pike, T. W., & Petrie, M. (2003). Potential mechanisms of avian sex manipulation. Biological reviews, 78(4), 553-574. Pike, T. W., & Petrie, M. (2005). Maternal body condition and plasma hormones affect offspring sex ratio in peafowl. Animal behaviour, 70(4), 745-751. Pinson, S. E., et al. (2015). Timing matters: corticosterone injections 4 h before ovulation bias sex ratios towards females in chickens. Journal of Comparative Physiology B, 185(5), 539-546. Sibiya, M. D., et al. (2025). Data integration reveals that a statewide corridor initiative maintains greater wild turkey relative abundance and occupancy. Landscape Ecology, 41(1), 6. Ulrey, E. E., et al. (2025). Female biased offspring sex ratios of eastern wild turkeys across the southeastern United States. Journal of Avian Biology, 2025(5), e03515. Wooten, M. T., et al. (2021). Effect of nutritional variance of energy and crude protein on sex ratio and development of W-36 parent offspring.   We've launched our second online wild turkey course  ! Enroll in  Wild Turkey Manager: Biology, History & Habitat to learn about the principal biology, mating, behavior, food selection, human dimensions, hunter interactions, and historical context of wild turkeys. This course is accredited by the Society of American Foresters as a Category 2 course worth 7 Continuing Forestry Education credits. Participants can also earn up to 5 CEUs in Category I of The Wildlife Society's Certified Wildlife Biologist Program. Enroll now: https://tinyurl.com/WildTurkeyManagerBio   Be sure to check out our first comprehensive online wild turkey course featuring experts across multiple institutions that specialize in habitat management and population management for wild turkeys. Earn up to 20.5 CFE hours! Enroll Now!    Dr. Marcus Lashley @DrDisturbance, Publications Dr. Will Gulsby @dr_will_gulsby, Publications Turkeys f