Seasonal changes in blood testosterone in the Giara horse
Floris, B.; Bini, P.P.; Nuvole, P.
Bollettino della Societa Italiana di Biologia Sperimentale 65(8): 735-741
1989
ISSN/ISBN: 0037-8771 PMID: 2803736 Document Number: 335149
The blood changes of testosterone in three Giara stallions, average age 8 years old and average weight 183 kg, were checked weekly for a year using a radioimmunological method. The horses showed a highly seasonal hormonal activity concentrated in the first half of the year (winter and spring). In the second half of the year (summer and fall) the stallions showed low levels of testosterone. The highest level of the androgen hormone occurred in April, the lowest in October. The absolute levels of this hormone agreed substantially with the literature values.