Why might a deer starve with a full stomach if the landscape is dominated by mature, low-quality grass?

Answer

Its quick digestive process cannot extract the necessary energy and nutrients from bulky material

The digestive physiology of the white-tailed deer, characteristic of a concentrate selector, is not optimized for processing large volumes of low-quality, highly fibrous forage like mature grass. While the deer's stomach is specialized, its passage time for food is relatively quick compared to true grazers. This rapid turnover means that if the deer consumes bulky material that is low in nutrient density—even if the stomach is physically full—the system cannot efficiently extract the required levels of energy and essential nutrients before the material passes through the digestive tract. Consequently, the deer remains nutritionally deficient despite having eaten large amounts of inappropriate bulk feed.

Why might a deer starve with a full stomach if the landscape is dominated by mature, low-quality grass?
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