The Effects of Tannic Acid and Lignosulfonate Treatments of Sunflower Seed Meal on the Digestibility and Rumen Degradability Characteristics of Some Nutrients in Rams


Abstract: This study involved two separate experiments to determine the effects of tannic acid and lignosulfonate treatments of sunflower seed meal on the digestibility and rumen degradability characteristics of some nutrients in rams. Sunflower seed meal was treated with 3, 6 and 9% tannic acid, 5 and 10% lignosulfonate. In the first experiment, the digestibility coefficients of dry matter, organic matter and crude protein of sunflower seed meal samples were determined by a faeces collection method using 5 merino rams aged 1.5 years and weighing 66.5 kg. Tannic acid treatments of sunflower seed meal at the level of 3, 6 and 9% did not have any effect on in vivo crude nutrient digestibility. Crude protein digestibility values were not affected by the treatment of 5% lignosulfonate of sunflower seed meal but were decreased significantly (p<0,01) by the the treatment of 10% lignosulfonate. In the second experiment, four ruminally cannulated mature merino rams were used to measure the rumen degradability characteristics of dry matter, organic matter and crude protein of meal samples. The maximum potential degradability value of crude protein was increased from 88.38% to 93.47% by 6% tannic acid but was decreased by 10% lignosulfonate treatment. The rumen effective crude protein degradability values were decreased by 3, 6 and 9% tannic acid and 10% lignosulfonate treatment. Therefore, sunflower seed meal treated with tannic acid at the levels of 3, 6 and 9% and lignosulfonate at the levels of 5 and 10% was not suitable because the treatment of meal with tannic acid and lignosulfonate at these levels had no positive effect on the in vivo crude protein digestibility and rumen degradability characteristics.

Keywords: Sunflower seed meal, lignosulfonate, tannic acid, rumen degradability characteristics, digestibility

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