Document Type : Research Paper
Authors
Assistant Professor of Animal Science Research Institute of Iran, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran.
Abstract
This experiment was performed to investigate the effect of feeding corn steep liquor (CSL) at levels 0, 50 or 100 g/kg dietary dry matter (DM) as nitrogen source on nitrogen retention and activities of carboxymethyl-cellulase (CMCase), microcrystalline-cellulase (MCCase), filter paper degrading (FPD) activities, ɑ-amylase and proteases in different fractions (i.e., particulate material (PM), extra cellular (EC) or cellular) of rumen liquor. Twenty seven male Moghani lambs were used in a completely randomized design with 9 animals in each treatment. Activity of CMCase in PM, EC and total (sum of PM, EC and cellular fractions) linearly decreased (P<0.05) with increasing the level of CSL in the diet. The activity of MCCase and FPD activity linearly decreased (P<0.05) with increasing level of CSL in the diet. Activity of ɑ-amylase activity was not affected by dietary treatments (P>0.05), however the protease activity linearly increased (P<0.05). All animals were in positive balance of nitrogen and nitrogen retention decreased linearly (P<0.05) with amount of CSL in the ration. Totally, using corn steep liquor in the diet of fattening lambs negatively affected nitrogen retention and activities of rumen fibrolytic enzymes and increased rumen proteases activity. However, economic analysis of performance data showed that incorporation of CSL up to 5 % of dietary DM covered reduced growth performance of animals through reducing ration cost.
Keywords
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