Abstract:

Tannins are polyphenolic compounds. Tannins are chemically divided into two main groups as hydro-lysable tannins and condensed tannins. Tannins are used in ruminants in order to prevent ruminal tympani and the formation of high methane gas. In the present study, it was aimed to determine the effects of tannin on of negative energy balance metabolism in dairy cattle. Animals, after the physical examination, were divided into 2 groups as study (test group n = 10) and control group (n = 10). Herbal extract (Quebracho Colorado) of tannin (Unitan Saica Inc., Argentina) which is appropri-ate for animal use, was applied 90 gr per animal daily for 6 weeks (each 3 weeks in pre and postpartum period) to animals in study group. While no any tannin or other additive was given to the animals in control group. Fae-ces, blood and milk (only after parturition on days 7, 14 and 21) samples were collected from both group on 21st day before parturition, during parturition and 7th, 14th, and 21st day from parturition. Beta hydroxybutyrate (BHB), albumin, calcium, phosphorus, total protein, BUN, GGT, cholesterol and triglycerides from blood sam-ples and milk urea nitrogen (MUN) levels from milk samples were evaluated. Difference between the groups for BUN, MUN, calcium, phosphorus, triglycerides, albumin, total protein and GGT was not detected. However, a decline was detected for BHB levels during parturition, 7th, 14th (not statistically significant) and 21st (statistical-ly significant) days after parturition in the study group compared to the control group. As a result; in animals, as detected lower BHB levels in animals applied tannin in study group compared to the control group, tannin can be used for the protection against negative energy balance.

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