Effect of Polyethylene Glycol and Urea Treated Pistachio by-products Silage on Phenolic Compounds, in vitro Gas Production and Holstein Dairy Cow’s Performance

Document Type : Scientific - Research Articles


Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran


Two experiments were conducted to evaluate the effect of ensiling and addition of polyethylene glycol (PEG)
and urea on chemical composition, phenolic compounds and cumulative in vitro gas production of fresh
pistachio by-products (PB) and effect of this treating on Holstein dairy cows performance. In the first
experiment, PB was supplemented with 1 and 0.5% of DM, PEG and urea, respectively and ensiled in 12 plastic
bags with the capacity of 3 kg each for 60 days. Ensiling PB treated with PEG and urea decreased total
phenolics, total tannins and condensed tannins (P