Milena MILOJEVIC, Sreten MITROVIC, TUGAY AYAŞAN, Tatjana ZDRALIC, Vladan DJERMANOVIC

Effects of Age and Sex of The Foal on The Gestation Length of Thoroughbred Mares

The purpose of this study was to determine the effects of age and sexof the foal on the gestation length of thoroughbred mares. The studycovered six stallions (of average age of 10.25 years) and 34 mares (ofaverage age of 10.51 years) with descent records (pedigree), EnglishThoroughbred horses raised and actively used for breeding at a studyfarm called Ljubičevo, located in Serbia. The following averagemorphological body measures were established: body weight (473.10kg), withers height (159.55 cm), body length (160.54 cm), chestcircumference (188.00 cm), and tibia circumference (19.21 cm) werefound to be within the scope of standard measures for this breed andparticular ages e.g. 9 to 15. The average gestation length, regardlessof the sex of the foal, was 336.57 days. The gestation of marescarrying male foals was somewhat longer (337.70 days) than ofmares carrying female foals (335.80 days). The difference (1.90 days)in gestation length was not statistically significant (P>0.05). A weakpositive correlation (rp=0.321) was observed between the age of themare and the gestation length (regardless of foal sex). Additionally, amedium correlation (rp=0.444) was observed between the mare's ageand the gestation length in the case of male foals, and a very weakcorrelation (rp=0.210) in the case of female foals.

Yavruların Yaşı ve Cinsiyetinin Safkan Kısrakların Gebelik Uzunluğu Üzerine Etkileri

Bu çalışmanın amacı, kısrak yaşı ve tay cinsiyetinin safkan kısrakların gebelik süreleri üzerine etkilerini saptamaktır. Çalışma, Sırbistan'da bulunan Ljubičevo adlı bir damızlık çiftliğinde yetiştirilen ve aktif olarak kullanılan safkan atlar içerisinde pedigri kayıtı bulunan altı aygır (ortalama 10.25 yaş) ve 34 kısrak (ortalama 10.51 yaş) ile yürütülmüştür. Morfolojik beden ölçüleri canlı ağırlık 473.10 kg), omuz yüksekliği (159.55 cm), beden uzunluğu (160.54 cm), göğüs çevresi (188.00 cm) ve tibia çevresi (19.21 cm) olarak hesaplanmıştır. Ortalama gebelik süresi 336.57 gün olarak bulunmuş olup erkek tay taşıyan kısrakların gebelik süresi (337.70 gün), dişi tay taşıyan kısraklara (335.80 gün) göre biraz daha uzun saptanmıştır. Kısrak yaşı ile gebelik süresi arasında zayıf pozitif korelasyon (rp = 0.321) gözlenmiştir. Ayrıca erkek taylar sözkonusu olduğunda, kısrak yaşı ile gebelik uzunluğu arasında orta bir korelasyon (rp = 0.444); dişi taylar söz konusu olduğunda ise çok zayıf bir korelasyon (rp = 0.210) gözlenmiştir.

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