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.: Home > Animal Science Papers and Reports > 2015 > Volume 33 Number 2 > Aleksandra Górecka-Bruzda 1 **, Mira Suwała 1 , Barbara Kamińska 2 , Zbigniew Jaworski 3 , Tadeusz Jezierski 1

Profiles of oestradiol, testosterone and androstenedione in stable vs. forest born young Konik Polski horses

Aleksandra Górecka-Bruzda 1 **, Mira Suwała 1 , Barbara Kamińska 2 , Zbigniew Jaworski 3 , Tadeusz Jezierski 1
1 Polish Academy of Sciences, Institute of Genetics and Animal Breeding, Jastrzębiec, 05-552 Magdalenka, Poland 2 University of Warmia and Mazury, Faculty of Biology and Biotechnology, Oczapowskiego 1A, 10-719 Olsztyn, Poland 3 University of Warmia and Mazury, Faculty of Animal Bioengineering, Oczapowskiego 5, 10-719 Olsztyn, Poland
Abstract :
Blood plasma profiles of equine sex steroids are useful in diagnose and for different scientific
purposes. The aim of this study was to monitor oestradiol, testosterone and androstenedione blood
plasma profiles in foals of age between 6 and 18 months, in order to establish the reference levels
for male and female of young Konik Polski horses. The effects of birth place (stable
vs
. forest), age
and season. Fifty two Konik Polski horses, born in the forest reserve (n=26) and in the stable (n=27)
were studied.
Level of oestradiol differed between sexes at the age of 12 months, whilst androgens were higher in
males of every age group. At all ages the level of oestradiol, testosterone and androstenedione did
not differ between stable and forest born colts and fillies, except for fillies at 18 months of age. The
highest
level of oestradiol in both colts and fillies was found at the age of 15 months,
i.e
. at the late
summer. In colts, testosterone and androstenedione concentrations were at their nadir at 6 and 9
months of age, then they rose abruptly at month 12 of age and remained significantly elevated until
month 18. In fillies, the highest concentrations of these androgens were found in August-September,
when the females were 15 months old. The profiles and the role of sex steroid hormones in social and
reproductive behaviours are discussed.
Keywords :
: androstenedione, colts, fillies, Konik Polski horses, oestradiol, testosterone

Date Deposited : 24 Mar 2016 10:33

Last Modified : 24 Mar 2016 10:33

Official URL: http://www.ighz.edu.pl/files/objects/7556/66/str_137-146.pdf

Volume 33, Number 2, April 2015

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