Just to touch on your ewe with TLD while the stress of injecting may have been a final push she was probably succumbing beforehand as it is a slow thing , when the lambs are starting to make serious demands on her body plus the space left to consume food is less , then she starts using body fat and if too much then the liver is overwhelmed and starts to poison her . Anything that stops here feeding for while lame /handling can then increase the problem . Harbro makes the Energyze Vitality bucket which contains Propylene Glycol and is supposed to help prevent TLD