Seasonal variations in serum concentrations of melatonin, testosterone, and progesterone in Arabian horse
| Autor: | Nesrin Sulu, Çiğdem Altinsaat, Aykut Göktürk Üner, Ahmet Ergün |
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| Rok vydání: | 2009 |
| Předmět: |
Estrous cycle
endocrine system medicine.medical_specialty General Veterinary media_common.quotation_subject Luteal phase Biology Melatonin Endocrinology Blood chemistry Internal medicine Follicular phase medicine Seasonal breeder Animal Science and Zoology Arabian horse Reproduction hormones hormone substitutes and hormone antagonists media_common medicine.drug |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1300-0861 |
| Popis: | Summary: The objective of this study was to characterize seasonal variations in serum concentrations of melatonin, testosterone, and progesterone in Arabian horses under natural photoperiodic conditions. Peripheral blood samples were collected during breeding and non-breeding seasons from mares and stallions. Serum concentrations of melatonin, testosterone, and progesterone were determined by radioimmunoassay. Serum concentrations of melatonin were greater in the non-breeding season (42.41±1.59 and 37.68±1.55 pg/ml) when compared to breeding season (23.52±1.24 and 17.22±2.10 pg/ml) in both mares and stallions, respectively. Melatonin concentrations were low but not different between the luteal and follicular phases during breeding season in cyclic mares. Mares had greater concentrations of melatonin than stallions in both breeding and non-breeding season. Mean concentrations of testosterone were greater during breeding season (6.58±0.50 ng/ml) than non-breeding season (3.64±0.48 ng/ml) in stallions. There was a negative correlation (r=-0.658, p |
| Databáze: | OpenAIRE |
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