>>11431172I think that was without hormones, and I think calving weight is 80% of adult body weight for a heifer and not hitting full adult body weight and skeletal structure until part way through 2nd lactation
but undergrown heifers was one of the biggest causes of mortality losses through dystocia, so you have to manage to the growth carefully if you get a feed deficit you create a lot of problems.
back in the old days on less nutritious diets cows might not calve until 2.5 to 3 years and on seasonal systems that is still common if you miss the specific service dates to hit the next grazing season.
