Differences in seasonal changes of fecal androgen levels between stabled and free-ranging Polish Konik stallions
ABSTRACT Blood and feces samples were collected from Polish Konik stallions kept under conventional stable conditions and in the forest reserve during a 1-year study period. Levels of testosterone (T) and androstenedione (A(4)) were measured using radioimmunoassay. Positive correlation between fecal and plasma concentrations of androgens was observed. Fecal T concentrations increased in April and May reaching peak value mid-April in the stallions from the reserve group and 2 weeks later in the stallions from the stable group. Comparatively, concentrations of T were higher in the stable group. Levels of T decreased in July, increasing through August to September, and decreasing again in October. During this period of increase, concentrations of T were higher in the reserve group. A peak of fecal A(4) concentrations in the reserve group was noted mid-April, but high levels of this androgen appeared later and remained longer (also in May). When the breeding season finished, the concentration of A(4) decreased and remained low. During breeding season, concentrations of A(4) were higher in fecal samples taken from stable stallions than from those in the reserve group. During non-breeding seasons levels of this androgen in both groups were similar. The individual differences in the fecal androgen levels were dependent on the behavior of the stallions and were not related to their age. The seasonal changes of fecal T and A(4) levels differed between stabled and free-ranging Polish Konik stallions.
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ABSTRACT: The aim of this study was to determine serum selenium concentrations in Polish Konik horses residing in the Odra Delta Nature Park (Poland) and to evaluate the activity of glutathione peroxidase and Se content in testes of this horse breed. In over 95% of cases, serum Se concentration was below the optimal range, and none of the horses examined was deficient in this trace element. The lack of Se deficiency in the animals examined suggests however, that the Polish Konik horses have a natural ability to the optimal use of nutrients available in their life area. Testicular content of Se and GSHPx activity in the colts was higher than those found in stallions, and a positive relationship between these antioxidants was demonstrated. The differences in Se contents and GSHPx activities in testes between colts and stallions suggest that selenoenzymes play important roles during the puberty of male horses.Polish journal of veterinary sciences 01/2014; 17(1):165-7. DOI:10.2478/pjvs-2014-0022 · 0.71 Impact Factor
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ABSTRACT: The aim of this study was to investigate the causes of chronic respiratory disorders in Polish Konik horses maintained in a stable and pasture, under condition typical for pleasure horses in Poland. The study was conducted on 14 adult horses, consistent with regard to environment and living conditions. The horses were divided into two groups: seven horses not affected by any respiratory problem (control group) and seven horses with history of lower airway disease (study group). Clinical and laboratory evaluation, endoscopic examination, bronchoalveolar lavage, tracheal wash, and lung ultrasound were performed in all horses. Median (25 th and 75 th percentiles) for bronchoalveolar lavage fluid differential cell count in control horses was 55.8 (49.8 and 59.1) of macrophages, 41 (38.5 and 45.9) of lymphocytes, and 5.1 (4.1 and 5.3) of neutrophils, whereas in the study group they were 32.8 (25.9 and 35.7) of macrophages, 59.8 (51.3 and 64.8) of lymphocytes, and 38.1 (34.8 and 41.1) of neutrophils. It was concluded that chronic respiratory disorders in Polish Konik horses were probably caused by recurrent airway obstruction.Bulletin- Veterinary Institute in Pulawy 01/2014; 58(1). DOI:10.2478/bvip-2014-0015 · 0.37 Impact Factor
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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. KEY WORDS: androstenedione / colts / fillies / Konik Polski horses / oestradiol / testosteroneAnimal science papers and reports 05/2015; 33(2):137-146. · 0.81 Impact Factor