Have you tried the "recommended code of handling for livestock"? They are written up for cattle, swine, etc. and have all kinds of info that you will be able to use and even more that you won't be able to use
The ones I've read are written up for the Canadian livestock industry but animals are animals so there will be info on the basics of animal requirements that you can use.
There are also hundreds of world-wide websites dedicated to raising different livestock and their requirements, and yes, it's not all intensive farming there is also lots on the type of holdings you have or wish to have - you just have to sift through it all to find what you want. Livestock people are almost always eager to share their knowledge so if you find a site you like, you can usually contact them and ask directly what you want to know.
I would also recommend government agriculture offices as they should be there to tell you "how" and will be able to inform you of your local regulations too.
There are many sites with livestock (swine,cattle,sheep,goat,chickens,etc) production budgets all laid out for you - ie. "swine production budget" etc. and they give you ideas on how much feed is required for a herd and the costs/expenses for an operation(you can do the math to figure out how much for one or two animals).
"Fiasco Farms" has an amazing website on goat production - A to Z! If you scroll through Self-sufficientish you will find numerous posts with exactly what you are looking for too - info on "small holdings" costs of production and requirements for various livestock and poultry.
You could check out some of the sites on "developing a business plan" - I worked on one this spring. A warning though - it's no mean feat to make an effective one and took me weeks/months to do the neccesary research and I ended up learning that what I wanted to do wasn't financially feasible enough to bother applying for the loans available for start-up
. Happily, I will keep working at it the "old-fashioned" way - that is, work at a job which will support my farming habit
. But then my plan was for a much bigger small farm than what you are looking into, so it won't be overwhelming for you (I hope
) - just informative.
Oodles of googles to gather
(
).
Sorry for writing a novel. Best of success with your research and project!
T.
Just wanna know if its even possible!! 
Yeah, I know - Dexters are nice... I know somebody up here who keeps them, maybe I can find out more for you. Still, you shouldn't keep just one cow; cows are gregarious animals, they need company. Human company would probably do - but do you want to move into the cowshed? 
if not the allotment & back to dreaming it is!! xx Thanks 4ur help guys 
