
A small amount of blood is not uncommon and should be monitored.
Combined with ill health it is a concern.

Usually from:
Salmonella
Coronavirus ( rare )
Coccidia
The temperature is high (40 plus)
Can cause respiratory symptoms as well (breathing above 50 per minute)
Calf aged between 3 and 14 days
If there is a normal or slightly raised temperature (38.5-39.5)
The calf is 5-30 days old
CORONA VIRUS Usually between 5 - 30 days of age and often occurs with rotavirus. Can cause respiratory signs just like Salmonella. Spread from cow shit and calf to calf.
If there is no temperature rise.
The calf is older 2 weeks plus
The calf is straining to pass faeces
Mob effect usually
COCCIDIA is a likely diagnosis
COCCIDIA Usually occurs from 1 - 2 weeks of age up to several months. Takes three weeks from ingestion to shedding lifecycle. Most cases are subclinical but stress and overwhelming loads will cause blood scours.
Treat all cases with electrolytes.
Only Salmonella will respond to antibiotics! But if you don't get a diagnosis or are unsure use antibiotics. Treat with Trisoprim. And pain relief from non steroidals.

Feeding a coccidiostat in your grain will help combat coccidia but in the face of an outbreak use Baycox. A single dose oral treatment for use up to 9 months of age. 3ml per 100kg. Withhold meat 56 days.
