DairyTalk 452: Earlier Calving, Lower First-Lactation Yield: When the Economics Still Work - by Helmut Demmelhuber

This podcast episode examines a scientific meta-analysis on age
at first calving and its implications for modern dairy production
systems. Across 16 prospective studies, researchers identified a
clear trade-off: heifers calving earlier produced less milk, fat,
and protein during their first lactation, yet showed no negative
effects on fertility, survival, calving difficulty, or
later-lactation performance. The analysis raises a central
management question for dairy farms: how far can rearing periods
be shortened without compromising long-term efficiency? The
featured article also challenges common assumptions about optimal
age at first calving and highlights why economic and biological
performance must be evaluated together. At the same time, the
authors emphasize the need for more controlled studies to define
reliable strategies for today’s high-performing dairy herds. With
comments on a "Journal of Dairy Science"-article (6/2026) by A.
K. G. Lean and others: https://www.journalofdairyscience.org