Choline Chloride (formerly known as "vitamin B₄") is found in animalsEssential water-soluble nutrientsIt can synthesize a small amount by itself, but it is far from enough and must be supplemented from the feed. Most of the choline in natural feed raw materials exists in a combined state.The biological utilization rate is relatively lowWhen free choline accounts for less than 10% of the total amount, it is necessary to add additional feed-grade choline chloride