Asia Dairy Network Website News from John Moran, your ADN Coordinator
I want to devote this Newsletter to describing one of the simplest measurements you can make on any farm, yet one of the most important ones that will reveal much about the farm’s feeding and herd management. That is the percentage of milking adult cows (and first lactation heifers) in the herd. This is one of the Key Performance Indicators (or KPI for short) of herd management.
For herds with a 12 month calving interval, lactation length should be 300 d (for a 65 d dry period), so lactation length would be the calving interval less 65 d, meaning that 82% of the cows are milking at any one time with 100% calving rate. However in most year-round calving systems, less than 75% of the adult cows are milking. The longer the dry period or the shorter the lactation length, the less the number of cows milking at any one time.