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Circadian variations in biochemical markers of bone metabolism in horse of different age

Author(s): Claudia Giannetto | Stefania Casella | Francesco Fazio | Vanessa Messina | Giuseppe Piccione

Journal: Journal of Applied Biomedicine
ISSN 1214-021X

Volume: 8;
Issue: 2;
Start page: 73;
Date: 2010;
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Keywords: circadian rhythms | osteocalcin | age | gender | horses

The author studied in thirty Thoroughbred horses the influence of age and gender on daily rhythms of serumosteocalcin (OC). The animals were divided into two groups. Group A: six male and six female 2 years old;Group B: six male, six female and six geldings 6 years old. They were housed individually in box-like stallsunder natural photoperiod and environmental conditions. Blood samples were collected every 3 hours overa 48 hour period. Statistical differences of serum OC concentration due to different gender were observed inboth Groups A and B. Daily rhythms of serum OC concentration were observed only in Group B, withnocturnal acrophase. In females the acrophase was statistically postponed for 1 hour compared to male andgelding. Male and female showed a more robust daily rhythm than the geldings. The results showed that bloodsampling for determination of serum OC should be strictly standardized with regard to the time of the day.
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