For a long time, this boost was indeed collecting from ALL animals. Pens and all. About 3 weeks ago it stopped working inside the pens. It was great!! When I used the boost, I would net an extra 100-150 energy from the mass quantity of animals.

Now it is just a tad bit helpful. Not really worth the efforts to earn the boosts. IMHO.

yeah i tried it on wedding cake and it didn't do double XP

I used it the other day but it doesn't seem to know about master faster which is why I had all the animals outside or raging bull.  I tried it with both and it just harvestes like usual with no extra XP or Mastery points.  I usually don't have very many animals outside but I decided I probably should do my masteries and quit stalling lol

@ Tonya -- No it dosen't Harvest anilmals inside the Pens. I have to complete the Blue Ribbon Mission so I have lot of Oxen outside, so it is good news for me. I can sell them for food

i used a couple of mine along with animal ready boosts, Fill your homestead with as many big buff bulls as you can fit (i also pulled out all my horses, mules, and turtles) rinse and repeat till they're full grown, then sell them for mucho food.

It has been working for me as well however it has not been harvesting the animals inside the pens.  Since most of my animals are in pens it has made it pretty much useless for me. I haven't tried in the last few days to see if it is now getting them all.