We had a buck come over and visit from November 26 till December 21... He was a very busy guy most of the time however he was about 4 inches shorter than my doe's...LOL and we really never saw him do the deed... maybe he was able to get them to lay down and cuddle durring the night...LOL. Are there signs that we can look for this early to determine if the girls are pregnant?
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Honestly the answer is no. When you start visiting the boards and you improve the diet of your goats, or start worming correctly, most goats start blooming, it's hard to tell that or pregnancy. Some young does will start maturing their teats, but then yearlings who are unbred wil do this just because they are maturing. A doe in milk will start to milk less, but than a doe who has never been asked to milk for a whole lactation would start drying up at that time anyway.
The longer the season goes, especially into Dec, Jan and Feb, heats turn nearly silent, rare even in Nubians to find a doe screaming at the fence for a buck, so even answering your question with the logical "yes, you can tell your doe is pregnant because she no longer is cycling" works well in the July, August and Sept, months, but not now.
Buy yourself a young buckling to use on your own goats next fall.
Most new folks don't have a confirmed pregnancy until the doe starts to udder up, in the case of does who don't udder much, who are super hairy and are not dairy clipped or who are poor milkers, the first clue of pregnancy is kids on the ground when you go out to do chores in the morning!

Vicki