Adding specific amounts of 5,6-dimethylbenzimidazole and cobalt to the diet of Kazakh rams increases the amount of microbial protein produced in the rumen three hours after feeding when the animals...

We analyzed one assertion on this topic and found that supplementing Kazakh rams with 5,6-dimethylbenzimidazole and cobalt appears to increase microbial protein production in the rumen three hours after feeding, specifically when the animals are on a high-concentrate diet [1]. This single observation is supported by 14.0 assertions, with no contradictory findings in the evidence we’ve reviewed so far. Microbial protein is made by bacteria in the rumen — the first stomach chamber in ruminants like sheep — and it’s an important source of protein for the animal. The compounds mentioned, 5,6-dimethylbenzimidazole and cobalt, are involved in the formation of vitamin B12, which some rumen bacteria need to function efficiently. The evidence suggests that adding these to the diet may help those bacteria produce more protein, especially after a meal rich in grains or concentrates. However, this finding comes from just one set of observations, and we don’t yet know if the effect lasts beyond three hours, if it happens under other feeding conditions, or how consistent it is across different animals. We also don’t have data on whether this change leads to better growth, health, or feed efficiency in the long term. What we’ve found so far leans toward the idea that this supplement combination may boost microbial protein under specific conditions, but we can’t say how broadly this applies. More studies would be needed to understand the full picture. If you’re managing Kazakh rams on a high-concentrate diet, this might be worth exploring under veterinary guidance — but don’t assume it will work the same way in all situations.