2011 Cilt 30 Sayı 2

Permanent URI for this collectionhttps://hdl.handle.net/11452/13941

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    Changes in serum protein and lipoprotein fractions during various lactation stages and dry period in dairy cows
    (Uludağ Üniversitesi, 2012-01-25) Güzel, Saime; Tanrıverdi, Meltem; Polat, Ümit; Uludağ Üniversitesi/Veteriner Fakültesi.
    The aim of this study was to determine the changes in the serum albumin, alpha 1 (α1)-globulin, alpha 2 (α2)-globulin, beta (β)-globulin, gamma (γ)-globulin, and alpha-lipoprotein (high density lipoprotein-HDL), pre-beta-lipoprotein (very low density lipoprotein-VLDL) and beta-lipoprotein (low density lipoprotein-LDL) and total lipid fractions of the cows in dry period and various stages of lactation period. Fourty healthy, four years old, Holstein dairy cows were used as material. Ten of them were in dry period and the rest were in lactation period. Between the days 48-51, 147-161. and 180. and over of lactation period were accepted as first, second and third stage, respectively. There were 10 cows in each lactation stages. Serum protein and lipoprotein fractions were compared between the dry period, first, second and third stages of lactation period. While significant differences were determined for α1-globulin, β-globulin, γ-globulin, HDL, VLDL, LDL and total lipid levels, no significant differences were observed in albumin and α2-globulin between dry period, first, second, third stages of lactation period
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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 )