The aim of present study was to determine the chemical composition and to estimate the nutritive value of Aprical tree leaves as feedstuffs for ruminants, after addition polyethylene glycol (PEG). Experimental materials were collected from different parts of Eastern Azerbaijan province (northwestern Iran). After drying the samples and provide uniform mix, chemical composition including dry matter (DM), crude protein (CP), ether extract (EE), crude ash (CA), neutral detergent fiber (NDF), acid detergent fiber (ADF), polyphenol and tannin compounds were estimated; 93.11, 3.54, 6, 15, 29.2, 20.8, 1.55 and 0.617 percent, respectively. Gas production test with mixtures of filtered rumen liquid of two Taleshi native male cattle rumen in time periods of 2, 4, 6, 8, 12, 24, 48, 72 and 96 hours were performed. Because of tannins content of experimental samples, we added PEG with 2:1 ratio (400 mg PEG: 200 mg sample) into gas test syringes, for evaluation of PEG effects. The PEG supplementation had also a significant (p<0.05) increase in the estimated parameters of gas production, Organic matter digestibility (OMD) and Metabolizable energy (ME) of Aprical tree leaves. Based on the obtained results it is concluded that the PEG supplementation reduce of tannins negative effects of Aprical tree leaves and suggested that the Aprical tree leaves has relatively good nutritional value for ruminant.
