[1.10] Need help to remove item from LootTable

I'm trying to remove items drop from Cows. The problem I'm having is that I don't know what's the name of the different LootPool that they hold.

With this example, I can remove the leather, but not the beef.

//REMOVE DROPS FROM COWS
	if (event.getName().equals(LootTableList.ENTITIES_COW)) {

		LootPool theLootPool = event.getTable().getPool("main");

		theLootPool.removeEntry("minecraft:leather");
		theLootPool.removeEntry("minecraft:beef");			

	}

I guess the problem is that actually the leather is the only item on LootPool main and the beef is on a different one.

So from there, I did some further investigation and found out that the beef is on a 2nd pool that we have to refer as "pool1" and there I was able to remove the beef.

My questions are. Is it possible to remove the drop in a general way even not knowing on what pool it is?

PS: Also, would it be possible to get a "pools" list, or a way to loop thru the pools?