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Hi, this is Dr. Bonk. I'm very sorry to hear about your kidding issues. It sounds like pregnancy toxemia or ketosis. Basically it's caused by low blood sugar brought on by the increased usage from carrying or lactating for twins or triplets. The doe then mobilizes glucose from other areas of the body to compensate leading to neurological dysfunction, stiff legs, recumbency and ultimately death if not treated. It is often seen in either really skinny does or overweight does right before or right after parturition.
Treatment is to increase concentrates in the ration, slowly to allow for acclimation and oral propylene glycol 60ml per doe twice a day for 3-4 days.
Advanced stages may require IV fluid treatment. In your case where you have multiple does already affected, propylene glycol or other dextrose supplement orally for everyone might be a good idea. You can also drench them with a CMPK (calcium, magnesium, phosphorus, potassium) solution as well.
If you have any further questions, please let me know. Thank you and good luck!