The effect of using different levels of tannic acid on performance and nutrient digestibility on milk consuming Semintal calves

The purpose of the current study was to determine the effect of different levels of tannic acid on performance and nutrient digestibility on Semintal calves in Shahrekord farm, Iran. A total of 40 ten day old Semintal calves were randomly assigned to the 4 experimental treatments with 10 calves each. The calves were feed by basal diet as control, 2.5, 5 and 10 gram per liter of tannic acid of their milk consumption respectively. The result showed that dietary inclusion different levels of tannic acid improved feed intake, body weight gain and feed conversion ratio in treated calves. As result revealed DM.OM, CP, NFC, ADF and ADF digestibility improved in treated calves compared to the control. The result of fecal consistency score showed that Inclusion of tannic acid resulted in improved fecal consistency at 0-50 days (P≤0.05).In conclusion using different levels of tannic acid could be useful and had good effects on performance and nutrient digestibility on Holstein dairy calves.