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- W2145027586 abstract "Two experiments were conducted to determine if plasma corticosterone and adrenal cholesterol and corticosterone levels differed among hens that laid soft-shelled (SS) or shell-less (SL) eggs when compared with hard-shelled (HS) egg layers. For Experiment 1, four groups of White Leghorn hens were bled at 22 to 34 weeks of age in the morning (0600 to 1200 hr) and at 66 to 74 weeks of age in the morning and evening (1500 to 1900 hr). Group 1 consisted of birds that had just laid SS or SL eggs, whereas Group 2 hens had SS or SL eggs in utero. Groups 3 and 4 represented hens with HS eggs in their uteri and hens that had just laid HS eggs, respectively. For Experiment 2, adrenal cholesterol and corticosterone levels were assayed in high (18+%) and low (0%) incidence SS plus SL egg layers at 73 and 78 weeks of age. Both younger and older hens that laid SS or SL eggs in the morning had similar plasma corticosterone concentrations when compared to HS egg layers. Morning plasma corticosterone levels were significantly higher among hens that laid an egg when compared to hens with eggs in utero, regardless of whether the egg was SS, SL, or HS. However, plasma corticosterone levels of hens producing SS or SL eggs in the evening were significantly higher than levels of hens that laid evening HS eggs. Evening HS egg layers demonstrated the oviposition related peak in plasma corticosterone, but concentrations were 1 ng/ml higher among the evening SS or SL egg layers. Adrenal cholesterol and corticosterone concentrations were similar between high and low incidence SS plus SL layers at either age. It is postulated that evening production of SS or SL eggs is a consequence of elevated plasma corticosterone." @default.
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- W2145027586 date "1984-09-01" @default.
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- W2145027586 title "Relationship of Plasma Corticosterone and Adrenal Cholesterol and Corticosterone to the Production of Soft-Shelled and Shell-Less Eggs" @default.
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- W2145027586 doi "https://doi.org/10.3382/ps.0631841" @default.
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