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Effects of processing with gamma ray, sodium hydroxide and calcium oxide on gas production parameters and digestibility of soybean straw

Document Type : Research Paper

Authors

1 M.Sc. Graduated, Department of Animal Science, Faculty of Agriculture and Natural resources, Gonbad Kavous University, Gonbad Kavous, Iran

2 Assistant Professor, Department of Animal Science, Faculty of Agriculture and Natural resources, Gonbad Kavous University, Gonbad Kavous, Iran

3 Expert, Iranian Mineral Processing Research Center, Karaj, Iran

Abstract

This research was conducted to determine the effect of gamma ray (GR) (100 and 150 kGy), sodium hydroxide (50 g/kg DM) and calcium oxide (160 g/kg DM) on gas production parameters and in vitro digestibility of soybean straw. All treatments, except for the gamma ray (100 and 150 kGy) did not have gas production up to 4 hours after incubation and there was a lag time. From 8 to 96 hours of incubation, the highest gas production was observed in sodium hydroxide + gamma ray (100 and 150 kGy) treatments (P< 0.05). Processing had no effect on gas production rate (P>0.05), but increased gas production potential (b) (P<0.05). The highest amount for b fraction was observed in sodium hydroxide + GR (100 and 150 kGy) treatment. Organic matter digestibility (OMD), metabolizable energy (ME), net energy (NE) and short chain fatty acids (SCFA) increased by processing (P<0.05). The highest increase was observed for sodium hydroxide (100 and 150 kGy). In vitro digestibility of the dry matter (DM) and organic matter (OM) was increased by GR, sodium hydroxide, and their combination (P<0.05). However, treatments with calcium oxide did not affect these traits. Except for GR at doses of 100 and 150 kGy, the other treatments reduced ammoniacal nitrogen (NH3-N) (P<0.05). Microbial mass production after 24 hours incubation showed decrease in calcium oxide and calcium oxide + GR treatments (P<0.05). Based on the results of this research, nutritional value of soybean straw improves with GR and sodium hydroxide treatments.

Keywords

References
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Animal Production
Volume 18, Issue 2
June 2016
Pages 235-248
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