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Daily rhythm of blood melatonin concentrations in sheep of different ages

Carcangiu, Vincenzo and Mura, Maria Consuelo and Parmeggiani, Albamaria and Piccione, Giuseppe and Bini, Pier Paolo and Cosso, Giovanni and Luridiana, Sebastiano (2013) Daily rhythm of blood melatonin concentrations in sheep of different ages. Biological rhythm research, Vol. 44 (6), p. 908-915. ISSN 0929-1016. eISSN 1744-4179. Article.

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DOI: 10.1080/09291016.2013.781317


The aim of the study was to investigate the daily pattern of melatonin during short photoperiods in sheep of different age. Thirty Sarda sheep kept under natural light conditions and divided into three equal groups were used: Group 1 (12–18 months); Group 2 (3–4 years); Group 3 (8–9 years). Blood samples were collected every 2 h for 22 h, starting at 21 December (12:00 h) until 22 December (10:00 h) for plasma melatonin radioimmunoassay determination. Statistical significant effect of time of day and age on melatonin concentration was registered. Mesor and amplitude values were statistically lower in Group 3 than in Groups 1 and 2. This study provides the first characterization of the relationship between age and daily pattern of melatonin in sheep, highlighting a decrease in melatonin production in the older animals.

Item Type:Article
ID Code:10059
Uncontrolled Keywords:Melatonin blood levels, Sarda sheep, circadian rhythm, aging, amplitude, acrophase
Subjects:Area 07 - Scienze agrarie e veterinarie > VET/02 Fisiologia veterinaria
Area 07 - Scienze agrarie e veterinarie > AGR/17 Zootecnica generale e miglioramento genetico
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Medicina Veterinaria
Publisher:Taylor & Francis
Deposited On:01 Sep 2014 17:59

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