Hi, I'm pretty new to goats and I have 5 milking nubian does right now their all 2 year old first fresheners but one who is 4 a year old. Any way we can't get weight on them. We've been switching to different grains trying to find the best one for us. And we just wormed them. We've been getting tons and tons of rain. It's been hot and sunny one day and cold wet and rainy the next, could that be doing it?