Linear type trait genetic trends in Irish Holstein-Friesian dairy animals

The objective of the present study was to investigate genetic trends 18 subjectively scored linear type traits describing animal morphology, as well udder, teat, feet and leg conformation. analysis undertaken using 2,932,700 Holstein-Friesian females born in Republic Ireland between years 2000 2020, inclusive. results indicate that have progressively become shorter stature shallower (i.e. body depth) less angular. reduction merit for score since year 2004 was, however, only observed non-herdbook-registered heifers. Furthermore, reducing depth narrower) angularity angular) approximately twice fast heifers it herdbook-registered Differences body-related calves versus those became cows existed prior 2010 with little biological differences thereafter; this observation common across most traits. Genetic locomotion animals has deteriorated over 20-yr period, while foot angle period is becoming lower; no such were animals. Large not themselves, but also mean udder when comparing non-registered calves. In conclusion, many evaluated trended relatively consistent a given direction, albeit cumulative change s.d. units per very small.