Read a vet's perspective on ketosis then answer a question

I had a client with a history of below average in-calf rates. There was nothing glaringly obvious that was contributing, all condition score targets were being met at appropriate times; transition feeding was on point. General reproductive management was good and there didn’t appear to be anything we were missing when compared to other farmers that were having more success.

I recalled reading research around the high levels of sub clinical ketosis in NZ dairy herds and the strong correlation between SCK and in-calf rates, if we could help control this then I knew there would be a positive effect on in-calf rates.

We decided to look at preventative measures and opted for the use of Rumenox administered through the water from calving through to mating. Although my client was initially reluctant, I reiterated the amount of research backing it had both internationally and locally, particularly around reducing sub clinical ketosis.

Scanning results showed a vast improvement in 6 week in-calf rates, although we know this can’t all necessarily be put down to Rumenox it has certainly proven to be a successful tool.

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Dairy NZ, Is elevated blood BHB a suitable indicator of poor performance in grazing cows?
Accessed 3 May 2022, available at
LIC & Dairy NZ, New Zealand Dairy Statistics 2019-2020, accessed 3 May 2022, available at
Frampton, LIC. In Calf Mating Strategies, accessed 3 May, 2022, available at