First, due to the lack of financial resources, subjectively want to save, there is no nutritional knowledge or lack of full-price view of feed and nutrition, do not know to add these substances in feed.

Second, the formula is irrational or not in accordance with the provisions of the formula, the production of feed resulting in a low level of nutrients in the diet, the lack of vitamins and trace elements.

Third, the use of certain spoilage of feed, so that certain nutrients are destroyed and can not be absorbed, but also hinder the absorption and utilization of other nutrients.

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