The volume of colostrum at the first milking after calving may have a bigger influence on colostrum quality than age of the dam, contends Jud Heinrichs, professor of dairy science at
Here are some other dam-related factors that can influence the IgG content of colostrum:
The dam’s immune status.
Length of the dry period. A three- to four-week dry period is necessary for maximum IgG concentration.
Leaking milk before calving. Avoid feeding colostrum from cows that leaked prior to calving.