Keeping livestock in a barn attracts a never ending stream of rodents such as rats and mice, that carry disease and ruin your feed.
Rats and mice are not only a nuisance, but they are also a hazard to all the animals in your barn, because they chew wires that can start a fire.
This is a homemade electric rat and mouse killer that you can make yourself, just using hardware cloth and a simple electric fence charger.
This way you do not have to use poison, that could harm your livestock and pets.
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To find out how to grow your own food like this see the book links here.
Secret Garden Of Survival : How to Grow a Camouflaged Food Forest
Secret Greenhouse of Survival : How to Build the Ultimate Homestead & Prepper Greenhouse
Secret Livestock of Survival : How to Raise the 10 Best Choices for Retreat and Homestead Livestock