Pretty much what it says on the tin.
Herders get NO animal skill. It boggles the mind. What were they herding? I mean I get that there are various other effects the skill is intended to represent - but clearly herders worked with animals extensively.
Farm oaf - a very good boost to growing and some mining. But even though the description mentions ox carts, no animal skill at all. IMO, animal skill comes before mining to a medieval farm oaf.
Maybe there are just so many other obvious animal related skills I haven't seen that they decided to put animal skill on a herder would be overkill.
Those Backstories were implemented long before the animal skill.
But yes it would have been a great Idea to upgrade those Backstories to fit the addition of this skill.
But that is what the Beta Phase will be about. Balancing and Fixing Inconsistencies.