The average age of heifers at first calving is improving, according to dairy scientists at Penn State University.
In 1985, the average age of Holsteins calving for the first time in Pennsylvania was 26.9 months. In 2011 that figure dropped to 25.5 months.
“In the past 4 years this decrease has been smaller, but that is to be expected as we approach a recommended goal of 23 to 24 months,” say Jud Heinrichs, professor of dairy science at Penn State, and Coleen Jones, research associate.
Read more in this article in the November 2012 issue of the Dairy Digest.