That is actually very helpful information and has prompted me to reconsider my most likely differentials. Luckily, there is help with both conditions.
Geographically speaking, I'm unsure of the incidence rate of Anaplasmosis in the upper Northwest. I feel this condition must be considered. There are several methods of transmission for this disease including, reused needles, ear taggers, dehorners, scalpels and surgical tools as well as through a biologic vector, the wood tick (Dermacentor). Diagnostics to rule this in or out may be as simple as a routine CBC and chemistry panel and a blood smear to look for the intracellular inclusions of Anaplasma marginale. Treatment protocols differ, but I have good luck using LA-200 or 300 as directed on the label and using intravenous doses of Flunixin meglumine (Banamine) to help reduce the fever associated with this condition.
The second condition I would consider is Leptospirosis. There are a couple possible modes of transmission of this disease as well depending on the serovar, or type, of Leptospira infecting the animal. There are 5 different serovars. The severity of the diseease, clinical signs and potential treatment and outcome depend upon the infecting agent. Although it is more labor intensive, I often use Penicillin G on a daily basis to treat these animals. Some serovars may remain in the reproductive tract and cause infertility which may be transient. Again sending a blood sample to your state diagnostic lab will determine if this disease is the culprit.
I might also recommend that if you are not currently using a vaccination program that includes protection against the 5 serovars of Lepto, please reevaluate and make some changes to include it. It is relatively inexpensive and will save a great deal of money in the long run.
I hope this helps and I welcome any more questions.