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Partial replacement of soyabean meal and rapeseed meal with a slow release urea source (Optigen® II) and its effect on microbial growth and metabolism in vitro.

Study to evaluate the effects of a slow release urea source (Optigen®) on microbial growth and metabolism in vitro.

Year of Publication2008

The objectives of the current study were to evaluate the effects of a slow release urea source (Optigen®) as a partial replacement for soyabean and rapeseed meal on microbial growth and metabolism in vitro. There was no significant effect of Optigen® on microbial growth or VFA production but fibre digestion was increased. There was no effect of treatment on mean fluid pH, volatile fatty acid (VFA) concentration or the ratio of acetate to propionate. Fibre digestibility was 0.12 g/g higher and organic matter digestibility tended (P=0.10) to be higher in vessels receiving Optigen®. There was no effect (P>0.05) of treatment on microbial protein synthesis (gN/d) or the efficiency of microbial protein synthesis when expressed as gN/kg apparently degraded (OMAD) or truly degraded (OMTD), although numerically microbial flow was highest in vessels receiving Optigen®. Hourly ammonia concentrations were higher (P<0.05) in vessels receiving Optigen® . Optigen® therefore may represent a suitable alternative source of rumen degradable protein in ruminant diets.

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Supporting the development of the national rural economy.

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