پردیس کشاورزی و منابع طبیعی دانشگاه تهران Iranian Journal of animal Science 2008-4773 48 4 2018 02 20 Investigating the effects of supplementing fattening lamb diet with small peptides of cottonseed meal on the digestibility and fermentation of nutrients in vitro Investigating the effects of supplementing fattening lamb diet with small peptides of cottonseed meal on the digestibility and fermentation of nutrients in vitro 549 558 65828 10.22059/ijas.2018.246708.653590 FA Elham Karimi M.Sc. Student, Department of Animal Science, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran Arash Azarfar Associate Professor, Department of Animal Science, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran Ayoub Azizi Assistant Professor, Department of Animal Science, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran Journal Article 2017 12 10 This study was conducted to investigate the effects of supplementing fattening lamb diet with various levels of commercial supplement Fortide C on in vitro gas production and fermentation parameters, nutrients digestibility and activity of rumen microbial enzymes in vitro using rumen liquor of sheep. This supplement is produced from enzymatic hydrolysis of cottonseed meal as a source of small chain peptides. Dietary treatments were control diet (without Fortide C) and supplementing control diet with Fortide C at the levels of 2.35, 4.70 and 7.70 g/kg of diet on dry matter basis. Results showed that at 16, 24 and 48 h of incubation, the highest and the lowest volume of gas production (GP) were observed in the diet containing the highest level of Fortide C and control diet, respectively (P<0.05). The highest microbial protein production and estimated metabolizable energy (ME) were observed in the diet supplemented with the highest level of Fortide C compared to the control diet (P<0.05). However, other fermentation parameters and two-stage nutrients digestibility were not affected by dietary treatments (P>0.05). Activity of carboxymethyl cellulase and alpha-amylase increased as the level of Fortide C increased in the diet compared to the control diet (P<0.05), while activity of microcrystalline cellulase and filter paper degrading activity were not affected by the experimental diets (P<0.05). In conclusion, the results of present study showed that dietary supplementation of fattening lambs with 7.05 g Fortide C per kilogram dry matter of diet improved microbial protein synthesis and ME in vitro. This study was conducted to investigate the effects of supplementing fattening lamb diet with various levels of commercial supplement Fortide C on in vitro gas production and fermentation parameters, nutrients digestibility and activity of rumen microbial enzymes in vitro using rumen liquor of sheep. This supplement is produced from enzymatic hydrolysis of cottonseed meal as a source of small chain peptides. Dietary treatments were control diet (without Fortide C) and supplementing control diet with Fortide C at the levels of 2.35, 4.70 and 7.70 g/kg of diet on dry matter basis. Results showed that at 16, 24 and 48 h of incubation, the highest and the lowest volume of gas production (GP) were observed in the diet containing the highest level of Fortide C and control diet, respectively (P<0.05). The highest microbial protein production and estimated metabolizable energy (ME) were observed in the diet supplemented with the highest level of Fortide C compared to the control diet (P<0.05). However, other fermentation parameters and two-stage nutrients digestibility were not affected by dietary treatments (P>0.05). Activity of carboxymethyl cellulase and alpha-amylase increased as the level of Fortide C increased in the diet compared to the control diet (P<0.05), while activity of microcrystalline cellulase and filter paper degrading activity were not affected by the experimental diets (P<0.05). In conclusion, the results of present study showed that dietary supplementation of fattening lambs with 7.05 g Fortide C per kilogram dry matter of diet improved microbial protein synthesis and ME in vitro.

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