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Build/improve fences, handling facilities, buildings and water sources. This is always important to do. Fences are more important than buildings, and water sources are more important than fences. Since you have to keep your new cattle confined for a few days in order for them to calm down and get settled in to their new home, a sturdy corral is important to have at all times for each and every time you bring new animals home. This location is also useful as a handling facility where you can easily handle them when they need to be loaded up to be sold to the auction mart or taken to the slaughterhouse.
Steel panels or sturdy wood fencing is best for keeping new-comers in for a few days, making sure they also have access to water and feed at all times. Pasture fencing can be caught up on when they are in after you bought them, or if you have to build fence, should be done before they come home.
Most buildings can be built and/or repaired after they come home, especially if you have bought weaned heifers that won't be calving until they're 2 years of age. All animals should have some form of shelter, though no matter what.
Water sources are a must. Automatic waterers that refresh themselves after the cattle drink and connect through piping that runs to a well or a ground cistern that collects ground water deep below the frost line (if you have a frost line where you live) are highly recommended to have and install.
Automatic waterers are a little more reliable when it comes to watering cattle, because a) you don't have to break ice every couple hours when it's 30 below 0, b) it often comes with a heating element on the other side of the flow tank, and c) you don't have to be out in a winter storm using a garden hose to fill up the tank.
Stock tanks may work for areas where there are a small number of cattle to care for and the seasons are quite mild, but when you come up north to the Great White North or Northern USA, watering cattle in the dead of winter is not a fun chore.