I have two goats, a Nubian and Nigerian 7 weeks They have been bottle fed and I am a first time mom to goats. They seem so dependent on their milk I worry when it is time to ween that they won't have enough to eat. I have introduced them to grain and hay. They love the grain but I'm scared of bloat. I have hung oak branches all over their area to graze but they really love their milk. I go to work every day and don't want the Nubian "Bill" screaming all day. Help?