I. Hristakov, I. Zhelyazkova, V. Hvarchilkov
Abstract. In this paper the use of stimulated feeding by additive syrup extract of Tribulus terrestris is investigated. Three groups of bee colonies are included in the study (a control and two experimental), which are stimulated with inverted sugar solution and supplement of extract from Tribulus terrestris and the veterinary medical product “Startovit” during the autumn of 2010. It is established that the average percentage of hibernated bees in the control group of beehives is 72%. For the experimental group stimulated with supplement of extract from Tribulus terrestris, it is 76,53% and for the group fed with a supplement of “Startovit” – 75,56%.The average honey consumption by one interhold with bees for the whole winter period within the families from the control group is 1,37 kg, for those stimulated with extract it is 1,01 kg and those stimulated with “Startovit” have consumed an average of 1,25 kg of honey per interhold. The results show that bee colonies stimulated with extract of Tribulus terrestris have the best winter resistance compared to the control group and the group fed with “Startovit”.