That way, the lighting system of your vehicle can coordinate well with the blinkers and brake lights installed on the trailer. 3. Check the tires of the trailer. You have to check the tire s sidewalls for dry rot or cracks. Trailers tend to crack since they are typically stored outdoors and receive little maintenance. The burial site must be at least two feet above the highest groundwater elevation. Burial sites should be selected to make sure that surface water and groundwater aquifers are not hydraulically connected to the burial site. It should be not less than 6 feet deep with a minimum of 30 inches of soil cover. The earliest evidence of horse domestication dates to around 4000 BCE. Older English sources, such as the King James Version of the Bible, refer to livestock in general as "cattle", as opposed to the word "deer", which then was used for wild animals which were not owned. The word cattle is derived from Middle English chatel, which meant all kinds of movable personal property, including of course livestock, which was differentiated from non-movable real-estate. Some livestock in these countries also convey groups of people and materials. Most livestock are raised on farms, but some people nurture small livestock like chickens at home. The main kinds of livestock raised throughout the whole world are pigs, poultry, cattle, and horses. And the science of breeding, rearing, and caring for livestock is called animal husbandry. Also, no livestock owners want a weak animal in his farm and the better way to prevent that is to mate their animals with healthier animals and of good quality and breed. An animal farm would die down if the animals residing in it is unhealthy and always sick. So, it is only important to maintain good health inside an animal farm because the possible diseases that may occur there could infect not just other animals but also people. The following are the various options available for people who want to raise farm animals as a business or a hobby. 1. Horses Breeding horses may seem exciting for people who love farm animals. But if your goal is to earn consistent income out of breeding horses, then you may be better off considering other options.