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It is known that the compositions of goat and sheep milk vary depending on factors such as animal breed, location, and way of nutrition, age and seasonal changes. Sheep milk contains higher levels of total solids than goat and cow milk. Casein fractions in goat, sheep and cow milk are same. However, casein micelles in goat and sheep milk differ in average diameter, hydration and mineralization from those of cow milk. As is the case with cow's milk, goat and sheep milk have simple and complex lipids, and liposoluble compounds. The average fat globule size is smallest in sheep milk followed by goat and cow milk. Non-protein nitrogen contents of goat milk are higher compared to cow milk. It has been found out that the researches and published articles on especially sheep milk, when compared to cow milk, are less limited. In this review, information related chemical characteristics and composition of goat and sheep milk is given. [ABSTRACT FROM AUTHOR]