keywords: Cattle manure vermicast, feedstuff, in vitro gas production, vermicomposting
Different processing methods have been used to develop ingredients for ruminants’ feedstuff from manure. It is important to study dynamics of rumen degradation of various potential feeds before using it to formulate diets for ruminants. The objectives of the study were to determine the effects of Rice straw treated with graded level of Cattle Manure Vermicast (CMV) on in vitro gas degradation kinetics and volatile fatty acids (VFA) production.Inclusion of varying levels of CMV has significant difference (P<0.05) on potential gas production (b). CMV inclusion reduces in vitro gas production, with 30 % CMV inclusion having least potential gas production of 31.13 mL/200mg. Comparing rice straw and CMV, there was significant difference (P<0.05) in b, CMV has the highest potential gas production (56.52 mL/200 mg) compared with rice straw (41.44 mL/200 mg). In vitro rumen effective degradability decreases with increased of CMV inclusion. Significant difference was observed onin 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. This shows that CMV inclusion has the potential of being used as by-pass protein.
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