Investigating the effects of supplementing fattening lamb diet with small peptides of cottonseed meal on the digestibility and fermentation of nutrients in vitro

Document Type : Research Paper

Authors

1 M.Sc. Student, Department of Animal Science, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran

2 Associate Professor, Department of Animal Science, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran

3 Assistant Professor, Department of Animal Science, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran

Abstract

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.

Keywords

References

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History

  • Receive Date: 10 December 2017
  • Revise Date: 26 February 2018
  • Accept Date: 27 February 2018

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