Sheep Going off Legs

[Farmerted119]

Hello
Got some BFL ewes which have had to come in onto straw early. Some of the multiples are going off their legs with being so heavy. Legs swelled etc. Had it before but just wondered if anyone jabs them with anything to help or just have to ride it out?
Thanks

 

[Stewartry hill]

Calcium and twin lamb to start with .If not not happy phone vet