2309.90.22 - Described in general note 15 of the tariff schedule and entered pursuant to its provisions

This HTS category, 2309.90.22, specifically covers animal feeds that contain milk or milk derivatives and, importantly, contain over 10 percent by weight of milk solids. These are preparations designed for animal nutrition where milk components are a significant ingredient, exceeding a 10% threshold based on their solid content. The description "Described in general note 15 of the tariff schedule and entered pursuant to its provisions" indicates that specific administrative requirements or definitions outlined in General Note 15 must be met for classification under this code, ensuring precise identification of eligible products.

It is crucial to distinguish this category from its siblings. HTS 2309.90.24 is reserved for animal feeds that, while also containing milk solids, must meet the criteria of Additional U.S. Note 2 to Chapter 23. This suggests a different set of specific conditions or product types are covered by that provision. HTS 2309.90.28, "Other," serves as a residual category for milk-containing animal feeds that do not meet the specific requirements of either 2309.90.22 or 2309.90.24, implying it captures milk-derived feeds with a lower milk solid percentage or those not conforming to the explicit descriptive clauses of the other subheadings.

Within this classification, two subcategories exist to further refine the product scope. HTS 2309.90.22.10 identifies "Milk replacer," which are specifically formulated to substitute for whole milk in animal feeding. The remaining products fitting the general criteria of 2309.90.22 but not qualifying as milk replacers fall under HTS 2309.90.22.90, "Other." This subdivision allows for the accurate classification of a broader range of milk-solid-rich animal feeds that do not fit the more specific "milk replacer" designation.