Seasonal Changes of FSH, LH, Total and Free Testosterone Hormones in Saanen Bucks

Year 2023, , 125 - 133, 19.01.2023

Çağrı Kandemir , Turgay Taşkın , Nedim Koşum

https://doi.org/10.33462/jotaf.1086419

Abstract

In the study, seasonal changes in follicle-stimulating hormone (FSH), lutein hormone (LH), total testosterone (TTH), and Free Testosterone Hormone (FTH) of Saanen goats were investigated. In order to determine the hormone levels between February 2019 and December 2019, blood samples were taken from bucks (n=6) twice a week during the entire trial. FSH level started to decrease relatively after August and the lowest value was determined as 173.01 mlU/ml in January. The difference between the months in the mean FSH level was found to be significant (p <0.05). The highest LH level was obtained in July (13.12 mIU/mL) and the lowest level (8.02 mIU/mL) was obtained in May. However, during the mating season, the increase in LH level was found to be similar to the FSH level. The difference in LH levels by months was found to be statistically significant (p<0.05). Total testosterone level was similar to FSH and LH levels. The highest and lowest total testosterone hormone (TTH) levels in March and January, respectively; 3.03 ng-/mL and 0.62 ng-/-mL. The highest free testosterone hormone (FTH) level was 119.69 pg/ml in August and the lowest was 29.09 pg/ml in December. The difference between FTH by months was significant (p<0.05). The effect of day length on seasonal variation of reproductive hormones in Saanen bucks is statistically significant (p<0.05). As a result, it was determined that reproductive hormone levels in Saanen bucks depend on the season and the release levels are significantly affected by climatic factors such as day length. To summarize, there is a need for more different studies including sampling frequency, sampling time as well as sample size, and other environmental factors in order to examine the effects of male reproductive characteristics and other important hormones in bucks in more detail to interpret the results more accurately.

Keywords

Saanen buck, Reproductive hormone, Seasonal change, Free testosterone hormone, Annual cycle

Supporting Institution

Ege University Scientific Research Projects Directorate

Project Number

2016-ZRF-070

Thanks

This study (2016-ZRF-070) was supported by Ege University Scientific Research Projects Directorate under Grant 2016-2019.

Seasonal Changes of FSH, LH, Total and Free Testosterone Hormones in Saanen Bucks

Abstract

Araştırmada, Saanen tekelerine ait folikül uyarıcı hormon (FSH), lutein hormon (LH), toplam testosteron (TTH) ve Serbest Testosteron Hormonunun (FTH) mevsimsel değişiklikleri incelenmiştir. Şubat 2019 ile Aralık 2019 arasındaki aylarda hormon düzeylerinin belirlenmesi için tekelerden (n=6) haftada iki kez olmak üzere tüm deneme süresince kan örnekleri alındı. FSH düzeyi, ağustos ayından sonra göreli olarak düşmeye başlamış ve en düşük değer ocak ayında 173.01 mlU/ml olarak belirlenmiştir. FSH düzeyi ortalamalarında aylar arasındaki fark anlamlı bulunmuştur (p <0.05). En yüksek LH düzeyi Temmuz (13.12 mIU/mL) ve en düşük düzey ise (8.02 mIU/mL) mayıs ayında elde edilmiştir. Ancak çiftleşme mevsiminde, LH düzeyindeki artışın FSH düzeyiyle benzer olduğu saptanmıştır. Aylara göre LH düzeylerindeki fark istatistiksel olarak önemli bulunmuştur (p<0.05). Toplam testosteron düzeyi, FSH ve LH düzeyi ile benzerlik göstermiştir. Mart ve ocak aylarında en yüksek ve en düşük toplam testosteron hormonu (TTH) düzeyi sırasıyla; 3.03 ng-/mL ve 0.62 ng-/-mL dir. En yüksek Serbest testosteron hormonu (FTH) düzeyi ağustos ayında 119.69 pg/ml, en düşük ise aralık ayında 29.09 pg/ml olarak belirlenmiştir. Aylara göre FTH arasındaki fark anlamlıdır (p<0.05). Saanen tekelerinde üreme hormonlarının mevsimsel değişimi üzerine gün uzunluğunun etkisi istatistiki olarak önemlidir (p<0.05). Sonuç olarak, Saanen tekelerinde üreme hormonu düzeylerinin mevsime bağlı olduğu ve salım düzeylerinin gün uzunluğu gibi iklimsel faktörlerden önemli ölçüde etkilendiği belirlenmiştir. Özetlemek gerekirse, tekelerde erkek üreme özellikleri ve diğer önemli hormonların etkilerini daha ayrıntılı incelemek ve sonuçların daha sağlıklı yorumlanabilmesi için örnek alma sıklığı, örnek alma zamanının yanı sıra örnek büyüklüğü ve diğer çevresel faktörlerin de içinde yer aldığı daha farklı çalışmalara da ihtiyaç vardır.

Keywords

Saanen teke, Üreme hormonu, Mevsimsel değişim, Serbest testesteron hormonu, Yıllık döngü

Project Number

2016-ZRF-070

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