2309.90.28.90 - Other

This classification, "Other," within the broader category of "Animal feeds containing milk or milk derivatives: Containing over 10 percent by weight of milk solids," encompasses a range of prepared animal feed products that meet the specified milk solids threshold but do not fit into more specific subcategories. These products are primarily intended for animal consumption and are characterized by a significant milk-based component, serving as a nutritional supplement or primary feed source for various animal species. Examples might include specialized calf starters, puppy or kitten milk replacers beyond the "milk replacer" designation (2309.90.28.10), or supplementary feeds for other young or convalescing animals where milk derivatives form the bulk of the protein and energy content.

The crucial distinction for this category lies in its residual nature. It serves as a catch-all for milk-solid-rich animal feeds that do not qualify for the immediately preceding sibling category, "Milk replacer" (2309.90.28.10). While both categories deal with milk-based animal feeds, "Milk replacer" generally refers to products specifically formulated to substitute for maternal milk, often for young mammals during their weaning or pre-weaning phases. This "Other" classification would capture other formulated feeds containing substantial milk solids, perhaps those with additional protein sources, carbohydrates, or mineral supplements, and not solely designed as a direct milk substitute.

As this HTS code represents a leaf node, there are no further subcategories to introduce. Therefore, classification under 2309.90.28.90 depends on the affirmative exclusion from more specific subheadings and the fulfillment of the overarching criteria: being a prepared animal feed, containing milk or milk derivatives, and specifically exceeding 10 percent by weight of milk solids. The importer must carefully consider the exact composition and intended use of the product to ensure correct classification within this residual provision.