Effects on Negative Energy Balance of Tannin in Dairy Cattle

Abstract

Tannins are polyphenolic compounds. Tannins are chemically divided into two main groups as hydrolysable 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 appropriate 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. Faeces, blood and milk (only after parturition on days 7, 14 and 21) samples were collected from both group on 21 st day before parturition, during parturition and 7 th, 14<