Why does cream usually not rise to the top of goat milk?

Cream does not typically rise to the top of goat milk because the fat globules in goat milk are naturally smaller than those found in cow milk.

In milk, cream rises to the surface because fat globules are less dense than the surrounding liquid. While commercial cow milk is often homogenized—a mechanical process that forces milk through high-pressure valves to break fat globules into tiny particles—to prevent cream separation, goat milk possesses a naturally smaller fat globule size that mimics this effect. Because these globules are already small, they remain more uniformly distributed throughout the liquid rather than coalescing and floating to the surface.123