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Birth weight. The birth weight evaluation includes individual weights on embryo transfer
calves out of registered Angus recipient females, provided any other NCE requirements for edited
data are met. The birth weight model includes direct and maternal genetic effects
Calving ease. Heifer calving ease EPDs were calculated using a multi-trait animal model including
birth weight and calving score data. The result is a heifer calving ease direct and heifer calving ease
maternal EPD, as defined below.
- Calving Ease Direct (CED): Calving Ease Direct EPD is expressed as percentage of unassisted births,
with a higher value indicating greater calving ease in first-calf heifers. It predicts the average difference
in ease with which a sire's calves will be born when he is bred to first-calf heifers.
- Calving Ease Maternal (CEM): Calving Ease Maternal EPD is expressed in percentage unassisted births with a
higher value indicating greater calving ease in first-calf daughters. It predicts the average ease with
which a sire's daughters will calve as first calf heifers when compared to daughters of other sires.
Related articles:
Birth weight EPDs and Calving Ease EPDs click here
Calving Ease EPD background click here
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