@pennykj I'm still looking into this issue. I think goats milk is preferred because it's better absorbed or more digestible. This article says: "When it comes to calcium absorption from goat milk versus cow milk, the plot thickens a bit. Both milks contain similar amounts of calcium per cup (around 300mg), but goat milk might have a slight edge in the absorption department. Some studies suggest that the smaller fat globules and different protein structure in goat milk could make its calcium more bioavailable."
https://hubforwellness.com/posts/cow-milk-vs-goat-milk-calcium-which-is-better-for-bones