2011 Cilt 30 Sayı 2

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Serum leptin levels during the dry period and various lactation stages in holstein dairy cows
(Uludağ Üniversitesi, 2012-01-25) Güzel, Saime; Tanrıverdi, Meltem; Doğrutekin, Deniz; Uludağ Üniversitesi/Veteriner Fakültesi.
In this study we investigated the effects of dry period and various stages of lactation on serum leptin, glucose, total cholesterol and β hydroxybutyrate levels in Holstein dairy cows. Fourthy, four years old Holstein dairy cows in their second lactation were used as material. Ten of them were in dry period and the rest were in different stages of lactation periods (10 cows for each stages). Serum concentrations of leptin, glucose, total cholesterol and β hydroxybutyrate were compared between the dry period, and first, second and third stages of lactation period. Correlation between leptin and other parameters were analyzed. While no significant differences were observed in β hydroxybutyrate levels, significant differences were determined for leptin, glucose and total cholesterol levels between dry period and first, second, and third stages of lactation period (p<0.05, p<0.001, and p<0.001, respectively). Statistically significant positive correlations were observed between leptin and glucose concentrations.(r =0,401, p<0.01 )