Bovine Abortions

So, let’s start!

There have been no issues in the past with the herd that the farmer can think of, they vaccinate against IBR/BVD and Lepto but BVD status is unknown. All cows which have aborted are in the milking herd (around 100 cows in total in the herd).

More information: cows were grazing on pasture with lots of public footpaths. The farm has two dogs.

So, how about some differentials?

Remember – S. Dublin is not necessarily assymptomatic in the dam. We might see diarrhoea, pyrexia and anorexia, either sporadic or as outbreaks, which can then lead to abortion.

A good summary on Salmonella can be found here: …

So focusing on Lepto and IBR, what would they look like? What else would we see on the farm?

Any other differentials? We’ve got BVD, IBR, Lepto and Salmonella so far …

What about Listeria or Q fever? How common are they?

How about Neospora? How would we diagnose it?

How would we go about looking for BVD?

When sending in aborted material, how likely is it that the cause will be found?

Now back to Neospora and the case …

In the majority of cases, calves from Neospora positive dams will appear perfectly normal but will be PIs. It is rare that Neospora is diagnosed in weak newborns.

The evidence demonstrating Neospora positive calves have a lower growth rate is not strong. The difference may not be clinically relevant after considering all the other variables which influence growth rate (diet, environment, etc.).

A brief practical overview can be found here: …

So is treatment to the rest of the herd worthwhile?

And that concludes this evening’s case!