First of all, feed the goats grass, It is one of the most inexpensive and natural way of filling them up. Eating grass, plants and bugs can help them put on weight. Make sure you feed them on daily basis in a field or pasture.
Corns and oats are also very important in this regard. Due to high carbohydrate content, grains are truly the easiest way to fatten up the goats. However, make sure your goat does not take more than one and a half pounds of grain per day.
To accelerate the weight gaining process, one must give the goat vitamins and minerals supplements. You may find special goat minerals and vitamins at the local feed store. Among the important minerals for goats are: phosphorus, magnesium, selenium, iron, calcium, and copper.
Protein feeding is another very important step. In case of less protein in a goat’s diet, the carbohydrates digests too quickly. As a result, the goats gain no weight.
Supplying good quantity of water is particularly important in order to avoid dehydration. This step becomes even more important in goats that are pregnant.