2022
DOI: 10.1002/jez.2602
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Yolk corticosterone and progesterone levels in Greater Rhea (Rhea americana) eggs vary in a changing social environment

Abstract: Maternal hormones in avian egg yolks may signal and prepare offspring for the prevailing conditions. However, this adjustment requires some degree of flexibility in regulating yolk hormone deposition. The Greater Rhea (Rhea americana) has a particular mating system that combines mixed polygyny and polyandry, communal nesting, and exclusive paternal care of chicks. In this species, we previously found that yolk hormone deposition varies among eggs of different captive populations and could influence chicks' phy… Show more

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Cited by 2 publications
(2 citation statements)
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References 38 publications
(56 reference statements)
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“…For example, using lipids supplements during avian feeding may have an effect on the hormone levels in eggs [12]. Environmental Factors: Stressors, temperature changes, and other environmental elements may have an impact on a bird's hormonal balance, which in turn may have an impact on the hormone levels in eggs [13]. The hen's age has also an impact on the hormones that are deposited in her eggs.…”
Section: Factors Affecting the Deposition Of Egg Yolk Hormonesmentioning
confidence: 99%
See 1 more Smart Citation
“…For example, using lipids supplements during avian feeding may have an effect on the hormone levels in eggs [12]. Environmental Factors: Stressors, temperature changes, and other environmental elements may have an impact on a bird's hormonal balance, which in turn may have an impact on the hormone levels in eggs [13]. The hen's age has also an impact on the hormones that are deposited in her eggs.…”
Section: Factors Affecting the Deposition Of Egg Yolk Hormonesmentioning
confidence: 99%
“…According to Hsu et al [26], precocial birds deposited more total thyroid hormones (T3 and T4) in their yolks than in altricial species. According to Della Costa et al [13], the development of chicks with a reduced stress was linked to higher yolk corticosterone and lower yolk progesterone levels.…”
Section: Types Of Maternal Yolk Hormonesmentioning
confidence: 99%