- Etlik Veteriner Mikrobiyoloji Dergisi
- Vol: 34 Issue: 1
- The effect of different particle sized rations and live yeast supplementation on energy profile in d...
The effect of different particle sized rations and live yeast supplementation on energy profile in dairy cows in heat stress
Authors : Çağlar Okulmuş, Hulusi Akçay, Necdet Ilker Içil, Özhan Türkyilmaz, Bahattin Koçer
Pages : 30-35
Doi:10.35864/evmd.1257761
View : 26 | Download : 41
Publication Date : 2023-06-20
Article Type : Research Article
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 <0.05). It was determined that the dry matter (DM), organic matter (OM) and neutral detergent fiber (NDF) consumption of dairy cattle under heat stress increased by decreasing the particle size in the ration, while the consumption of non fiber carbonhydrate (NFC) was not affected. In addition, it was observed that NEFA and BHBA in the sera of dairy cattles decreased significantly with the decrease in the particle size in the ration. Considering the data obtained from the present study, it can be said that reducing the particle size and supplementing of LY in the rations of dairy cattle under heat stress ameliorate the metabolic energy balance.Keywords : Süt sığırı, canlı maya kültürü, enerji dengesi, parçacık boyutu, sıcak stresi