Well I finish this part, thought it was going to be longer but I did a lil a trick.
IF you can: trade in your bear collection and get a animal ready boost, then trade in your barn collection and get a animal harvest boost (if you have tons of animals) just before you use the boost tend to the already hungry animals so you do not miss out on that xp.
if you do not have the items put them on your wishlist and share it I was missing one item from each collection, posted it and expecting one got lucky and got 3 of each, and had a lot of the other items so I traded them in 3 times then boom last phase of growth 9 hours but I got adult cows in less than 5 minutes hehe. Just wish I remembered what collection those boosts came from sooner and had them, now I know and will ask for the stuff every other day and save em lol