Situation: Calves between 4 and 8 weeks of age with diarrhea. Already gone through three threatments with Corid for coccidiosis. No apparent response to Corid - diarrhea continuing in intensity and duration. A few calves dying.
Water samples from the source used to mix milk replacer and water calves sent to lab. Results came back: "20 immature Giardia in sample."
Well, isn't that an unwelcome piece of news? With all the rain and runoff this spring in the western part of New York State this is not the first dairy to have their water supply compromised with surface water.
For a short information piece on this parasite see