The changes are still making their way into Warhammer Online. With their most recent patch, the developers are allowing players to switch out scavenging for butchery due to some changes with the apothecary system. Here's the official post:

As many of you may have noticed in the Game Update 1.2 Patch notes, we have given players the ability to exchange their current level of Scavenging for an equal level of Butchering. This was implemented due to the changes to the Apothecary trade skill.

In order to perform this switch you will need to visit either Lorne Foulsteel in The Inevitable City (Destruction) or Elsbeth Reiss in Altdorf (Order) They will then give you a quest to complete, "Welcome to the Meat Market", which will correctly train you in the Butchering trade skill if you had the Scavenging trade skill.

As always, thanks for your continued support and WAAAGH!

If you need any other tips of tricks, make sure you check out our Warhammer Online community site!