[Raywood]

Any ideas what's caused this ?

 

[DoubleR]

Did he have diarrhea? That would be my guess. Had the runs and it clumps on their tail. Hair falls out sometimes.
Otherwise mom might be over cleaning. Probably diarrhea.

 

[Raywood]

She's only 3 weeks old and not had the runs at all, it's right down her legs and her tail

 

[DoubleR]

Interesting!
That's the normal locations for scours "run off".
Have you checked your herd for parasites?
Have you seen mom over cleaning?

 

[Raywood]

All the others are fine, didant notice mum over cleaning but she might be

 

[DoubleR]

Moms (especially new moms) have been known to over clean. Because it's a heifer calf id bet that's what's happening.

 

[Raywood]

Is their anything I should do or will it just sort it's self out ?

 

[DoubleR]

IF that's what's going on then it will just sort itself out. Just watch for open sore/raw spots.
Watch to be sure no one else has anything similar going on.

 

[cowfarmer]

Weird I never seen that

 

[Raywood]

It's all grown back now and calf is thriving

 

[DoubleR]

Mama's a clean freak lol!