RELATIONSHIPIS BETWEEN BLOOD HORMONES AND METABOLITES IN SIMMENTAL DAIRY COWS DURING TRANSITION PERIOD AND MID LACTATION
Radojica Đoković. Zoran Ilić. Vladimir Kurćubić. Milun Petrović. Marko Cincović. Miroslav Lalović. Boban Jašović
University of Kragujevac, Department of Animal Science, Faculty of Agronomy Čačak, Cara Dušana 34, 32 000 Čačak, Serbia,
radojicadjokovic@gmail.com
The main purpose of this article, was investigation metabolic and endocrine status in Simmental dairy cows during transition period and mid lactation, based on the relationships between blood growth hormone (GH), insulin, triiodothironine (T3), thyroxine (T4), glucose, beta-hydroxybutyrate (BHB), non-esterified fatty acids (NEFA) and triglycerides (TG). For the analysis were chosen 45 Simmental cows divided in three equal groups and each group was consist of fifteen cows: Group 1 was late pregnant cows, group 2 was early lactation cows and group 3 was mid lactation cows. Blood metabolic hormones as well as metabolites were analyzed and obtained results were recorded. Second group of early lactation cows have significant higher blood serum concentrations of GH (p<0.05), NEFA (p<0.05) and BHB (p<0.05) and significant lower blood serum concentrations of insulin (p>0.05), T3 (p<0.05), T4 (p>0.05), glucose (p<0.05) and TG (p<0.05) compared with the first group of late pregnancy cows and third group of mid lactation cows. Significant positive correlations (p<0.05) were noticeable between GH and NEFA, T3 and insulin, T3 and T4, glucose and T3, glucose and TG and negative (p<0.05) between glucose and NEFA and glucose and BHB. These hormonal and metabolic changes can be useful indicators of the metabolic and endocrine status of dairy cows.
Keywords: Simmental dairy cows; blood hormones; blood metabolites
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