What is the word for a person who does animal husbandry?

From thefreedictionary...

stockman
1. (Agriculture)
a. a man engaged in the rearing or care of farm livestock, esp cattle

livestock
1. (Agriculture) (functioning as singular or plural)
cattle, horses, poultry, and similar animals kept for domestic use (not as pets), esp on a farm or ranch

I think farmer is a general term that may fit your description: You usually need to specify the breed like, cattle farmer, sheep farmer, pig farmer etc.

• (Agriculture) a person who operates or manages a farm.

• A farmer (also called an agriculturer) is a person engaged in agriculture, raising living organisms for food or raw materials. The term usually applies to people who do some combination of raising field crops, orchards, vineyards, poultry, or other livestock.

Source: www.en.wikipedia.org

In the U.S., they are often called livestock producers. There is a National Livestock Producers Association, which is an organization with 215,000 beef, dairy, hog, sheep and goat producers as members.

Then it can be broken down into more specific types of producers: cattle producers, dairy producers, pork producers, goat producers, poultry producers, etc.

Husbandman. From The Bible, King James Version:

Jeremiah 51:23 I will also break in pieces with thee the shepherd and his flock; and with thee will I break in pieces the husbandman and his yoke of oxen; and with thee will I break in pieces captains and rulers.

Zechariah 13:5 But he shall say, I am no prophet, I am an husbandman; for man taught me to keep cattle from my youth.