When a bull is castrated he now becomes a steer, the only time that a female is called anything different is when she is born as a twin to a male calf, this is when she is called a "free martin". Farmers do not "de-sex" females.
A male desexed Guinea Pig is called "Neutered", and a female desexed Guinea Pig is known as "Spayed".
Wether
it is called a buck A desexed male goat is called a wether
a neutered dog
The name for a castrated (desexed) male pig is a barrow.
It is not normally economical to desex a female sheep. Even if she was to be desexed she would still be called a ewe.
A cattle stall is called a crib.
A group of cattle is called a herd.
it may be...
A number of cattle is called a herd of cattle. A number of pigs is called also called a herd.
A stallion and a desexed male horse is called a gelding. a pony. (In order to be a pony they have to be less than 10 hands tall)
It can be called a ranch or a cattle farm.