Pelvic size

[HFSC]

At what age does a heifer need be before you can get an accurate pelvic mesurement?

 

[Kenny]

We measure are heifers 30 to 45 days before we breed, we also give their pre breeding shots at the same time

 

[CAB]

Kenny that is the sensible time to do it. There is a formula for adjusting pelvic measurements just like there is a formula for adjusting weaning/yearling wts.
  What are acceptable minimum pelvic measurements for heifers?

 

[Kenny]

We sell bred heifers in the Missouri Show-Me Select heifer sale and at prebreeding exam they have to be minimum of 150 cm2 if not you can remeasure with in 90 days of breeding and be a minimum of 180cm2. Yes there is a chart to calculate pelvic size but I could not locate it. Pelvic measuring really helps us decide on what bulls we use small pelvic low epd Angus, bigger pelvic Maine calving ease bulls.Last year we had heifers that measured from 130cm2 to 200cm2. so far out off 16 heifers we have had to slightly assist 2 of them and probably they  would of had them just was too impatience

 

[DL]

Yearling pelvic measurements average 140 to 170 cm sq and can be adjusted to calving age by adding 0.27 cm sq per day (probably more math that you need )