The Effects Of Rice Straw Supplemented With Cattle Manure Vermicast On In Sacco And In Vitro Rumen Degradation
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Date
2015-01
Authors
AMINU, NASIRU
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Abstract
Different processing methods have been employed to produce ingredients for ruminants’ feedstuff from manure. Vermicomposting, a tool for biomass management can be employed as means for manure treatment. It is imperative to study the dynamics of rumen degradation of various potential feeds before using it to formulate diets for ruminant. The objectives of the study were to determine nutritive value of cattle manure vermicast (CMV), its inclusion effect on rice straw on in vitro ruminal gas production, in sacco rumen degradability and to determine cellulase and xylanase enzymes activities during cattle manure vermicomposting. Cattle manure was collected and vermicomposted with Eudrilus eugeniae (African Night crawler). Samples were collected at week 2, 4, and 6 for proximate composition analyses. The rumen degradation and gas production characteristics of rice straw supplemented CMV were investigated in vitro and in sacco using rumen fistulated kajang goats. Degradation profiles namely meteabolisable energy, dry matter degradability, microbial crude protein and partitioning factor at 48 h were determined. The exponential model of Ørskov and McDonald was used to estimate degradation kinetics. Volatile fatty acids production (VFA) was also analysed and cellulolytic enzymes activities were determined. The results obtained shows that increase in vermicomposting duration significantly increases (P<0.05) crude protein and ash contents, and significantly decreases (P<0.05) organic matter, neutral detergent fibre and acid detergent fibre. Cellulolytic bacteria count increased with vermicomposting duration. Likewise, CMCase, Fpase, β-glucosidase and xylanase increased with increase in vermicomposting period. in vitro gas production
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decreased significantly (P<0.05) with an increase in CMV inclusion to rice straw. The CMV inclusion significantly (P<0.05) reduces in vitro dry matter degradability and increases partitioning factor at 48h and microbial crude protein in vitro. CMV inclusion reduces (P<0.05) in vitro rumen effective degradability. Significant difference was observed on in vitro rumen VFA production. However, it does not correspond with an increase of CMV inclusion. There was no significant difference on acetic acid propionic acid ratio (A: P), but CMV increases butyric acid significantly (P<0.05) with corresponding increase of CMV inclusion. in sacco rumen degradability shows that effective degradability decreased (P<0.05) with increase in CMV inclusion. However, CMV diet has no significant effect (P>0.05) on dry matter, crude protein and neutral detergent effective degradability respectively. CMV inclusion on rice straw significantly (P<0.05) reduces in sacco crude protein degradability and increased in sacco NDF degradability. Feeding CMV treated diet for in sacco degradability has significant effect (P<0.05) on total VFA production with 10% inclusion having the highest value. The same pattern of in vitro effect on VFA was observed on in sacco VFA production. In conclusion, Vermicomposting increases the nutritive value of cattle manure. From in sacco and in vitro evaluation, CMV has the potential of feed ingredient for small ruminants. It is recommended that more experiments should be carried out to ascertain the true nutritive value of cattle manure vermicast.
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The Effects Of Rice Straw Supplemented With Cattle Manure Vermicast , On In Sacco And In Vitro Rumen Degradation