There are varying levels of fat in milk replacers. Lower levels of fat (10%) are usually adequate for summertime feeding, says Bob James, Virginia Tech extension dairy scientist. However, higher fat levels (20%) are more appropriate for winter feeding when energy requirements are higher. Replacers with 25% fat are recommended for smaller breeds, such as Jerseys, because of their higher maintenance requirements.
The most important concept to remember, though, is that the percentages are not as important as the total amount of protein or fat consumed, James says. He explains more in the January/February 2013 Virginia Tech Dairy Pipeline.
Source: January/February 2013 Virginia Tech Dairy Pipeline