Welcome Chris,
Good question for a first post.
Akane's correct. Depending upon the goals of others, you'll receive varied
replies. The goals for folks breeding for the show table are far different
than those that are breeding for the dinner table.
Personally, I've got a small 42 doe commercial NZW herd. First time mothers
are bred around 5-6 months old, depending upon their weight and behavior
at the time. I've found that young does a shade over 5 months weighing
eight pounds that readily stand for a buck will oftentimes be excellent brood
does.
With the strain that I work with, keeping them busy raising youngsters helps
with production and lessens their chances of becoming a "lazy" doe. Or, ones
that become lackadaisical when it comes to production. Once a doe has had
a barren period, it's tough to get them back into their routine. Again, these
are "my" does and I can only attest to what this strain will do under certain
circumstances. Other lines quite likely will respond differently to my methods.
A pic of my main breeding room holding 35 does and 7 bucks.
A pic of one side of my grow-out room.
Hope this helps.
Grumpy.