Domain names

Hello Warriors,

Sorry For the Title, I was Actually going to ask another question so ignore the title on this one Forgot to change it before I hit the post button
OK have a couple questions here and hope someone will help.

As it turns out I set up a site about a year ago and have done nothing with it, after looking today I see that a few of my sites pages are ranking on the second page of Google which is great . I believe with some further seo i can get them to move to page one.
Here is the question.
My site revolves around a search term that can lead in many directions.
This is not it but for example let's say my domain was something like

howtoraisea.com (example) so my posts or pages on the site might be and this is the question
should they be howtoraisea.com/cow howtoraisea.com/chicken
or
should they be
howtoraisea.com/howtoraiseacow howtoraisea.com/howtoraiseacow

I am wondering, if the exact search term in Google is how to raise a cow
which structure would be better for Google

Second question Is there any SEO strength if over time I got say, how to raise a cow.com and how to raise a chicken.com and forwarded them to the pages on the main site

REMEMBER THE Above is only an example

Thanks For the Help