Abstract
The aim of the present study was to determine the effect of adding different sized feed particles and live yeast culture (LY) to the rations of dairy cattle on their metabolic energy balance and some blood parameters under heat stress conditions. In this study, four Holstein-Fresiean dairy cattle (600 ± 25 kg of BW) in the middle of the lactation, which gave multiple births, were used. The cattle were fed with diets containing 2 different doses of LY additives (0 and 1 g/day/dairy cattle) in 2 different particle sizes (High particle size (HPS) and Short particle size (SPS)). The experiment was carried out in 2x2 factorial plane and 4x4 latin square pattern. During the study, it was determined that the averages of the temperature humidity index (THI) were above 76.
 In the present study, the effect of LY supplementation on the live weight (BW) change and on feed consumption was not determined. However, it was observed that the non esterified fatty acids (NEFA), beta hydroxybutyric acid (BHBA) and glucose levels of dairy cattle decreased significantly, while the urea level increased with the supplementation of LY to the ration (P
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