Cortisol is a key hormone in several physiological functions. The aim of this work was to assay cortisol in the hair of foals and verify whether its concentrations changes during the neonatal period. Hair samples were collected from 18 foals at birth and then one and two months later. Cortisol was extracted by methanol and assayed using a RIA method. Mean cortisol concentrations decreased significantly (P<0,001) after birth from 60,39 ± 4,03 pg/mg to 36,62 ± 4,63 pg/mg (at 30 days) and to 16,42 ±2,02 pg/mg (at 60 days). Considering the birth event as the highest physiological stressor for a foal, the cortisol levels found at this stage were used as a reference to calculate percentage cortisol changes in the postnatal period. After one month, one foal presented a 94% reduction in cortisol concentrations, while most foals a decrease from 10% to 66%. After 60 days, mean cortisol levels were 42% lower in all animals. It remains to be explained what factors (environment, physiological conditions, and/or management) are responsible for the persistently high cortisol concentrations in the postnatal period up to two months of age.

LIVELLI DI CORTISOLO NEL PELO DURANTE IL PERIODO NEONATALE NEL PULEDRO

MONTILLO, MARTA;
2009

Abstract

Cortisol is a key hormone in several physiological functions. The aim of this work was to assay cortisol in the hair of foals and verify whether its concentrations changes during the neonatal period. Hair samples were collected from 18 foals at birth and then one and two months later. Cortisol was extracted by methanol and assayed using a RIA method. Mean cortisol concentrations decreased significantly (P<0,001) after birth from 60,39 ± 4,03 pg/mg to 36,62 ± 4,63 pg/mg (at 30 days) and to 16,42 ±2,02 pg/mg (at 60 days). Considering the birth event as the highest physiological stressor for a foal, the cortisol levels found at this stage were used as a reference to calculate percentage cortisol changes in the postnatal period. After one month, one foal presented a 94% reduction in cortisol concentrations, while most foals a decrease from 10% to 66%. After 60 days, mean cortisol levels were 42% lower in all animals. It remains to be explained what factors (environment, physiological conditions, and/or management) are responsible for the persistently high cortisol concentrations in the postnatal period up to two months of age.
Atti della Società Italiana delle Scienze Veterinarie
53
55
Montillo M; Amodeo S; Comin A; Valentini S; Renaville B; Cornacchia G; Prandi A
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/104159
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