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Role of treatment soybean meal with pistachio extract on total tract nutrients digestibility of Holstein bulls
This experiment was conducted to study the effects of treatment soybean meal (SBM) with pistachio extract on total tract nutrients digestibility of Holstein bulls. The sun dried pistachio hulls were grounded through a 0.5 mm screen and soaked in water (1 pistachio: 10 water). Filtered extract was concentrated by heating at 95 ̊C. SBM was treated with pistachio concentrated extract (PCE) containing 11.14 % total phenol and 7.13% total tannin /DM of extract. Twenty-eight Holstein bulls (average initial weight 256±63kg) were assigned randomly to one of four treatments with seven replicates in a completely randomized design for 94 days. Bulls were fed 70% concentrate diets and had free access to balanced total mixed ration (TMR) and fresh water. All bulls were individually fed and 10 d before the start of the experiment were adapted to the experimental diets. Treatments included: 1; control (SBM without PCE) 2; SBM with 5% PEC 3; SBM with 10% PEC and 4; SBM treated with 15% (kg PEC/100kg DM SBM). Total-tract apparent digestibility of DM, organic matter (OM), CP, NDF and EE were determined using acid-insoluble ash as a marker. There was no effect (P<0.05) of tannin supplementation on total tract nutrient digestibility such as: DM, OM, CP, EE and NDF. These results suggested that high levels of PCE can be used in diet without any adverse effects on total tract nutrient digestibility in bulls.
Keywords: Nutrients digestibility, Pistachios hulls, Tannin