Ok, a bunch of questions and comments: I am really delighted to have DT now. As far as I can tell, the fact that you can't tame (to "tame") the newly breeding creatures without child states recognized by animal trainers is a bug (DT shows them as babies etc. but in game they are shown as full animals regardless of size).
So, while I can have a fully trainerless tame draltha population by the third generation, and trade away my original (bonded) breeding pair, my voracious cave crawlers will need reinforcement even in 2n, 3rd, 4th generation leading to trainer bonding, which makes me shy away from slaughtering them even if the bonding isn't that strong anymore with the trainer now up to legendary.
Now with DT transitioning from one generation to another is much less gambling than it was without. I guess I can with proper care = separation and tedium identify infertile females, but how can I possibly even make a call in game for the males without using DT? (I would keep more than one male anyway, a single animal dies too easy for no particular reason at all.)
War / hunting (or other dangerous) animals:
Even if I selectively breed my animals, apart from scientific value, does it really make a difference in warfare outside of challenge play (defend only with animals etc.)? I always saw the war animals as of somewhat limited use in military roles.
Livestock:
Wish my sheep had survived the FB attacks - sheep (and stoats) are also the most popular animal in my dwarves, nobody even likes the exotics I made available for adoption
Can I increase wool / milk returns by selective breeding?
Purring maggots:
Despite years of trapping more than a hundred of vermin I have yet to see a single purring maggot. Do they have special biome preferences? In absence of sheeps they would have been my second best guess for milk->cheese.
GCS:
I have a working GCS farm (with a wild GCS), not fully automatic but producing batches of several hundred silk at a time, but I start to worry about the future. As they breed now according to the wiki, if I manage to catch a complementary spider, can I train them temporarily to make them breed and wait for the offspring to go wild again? Would this make them / their offspring trapavoid? (Big question mark!) Or can I operate the silk farm easier with tame animals anyway? How is the behavior of trained GCS - do they even react to normal opponents anymore?