Compute how much of the dam’s body weight the calf represents at weaning — a simple cow-efficiency check used alongside adjusted 205-day weight.
Use this when you have a calf weaning weight (actual or adjusted 205-day) and a dam weight taken near weaning, and you want the classic percent-of-dam figure for culling or benchmarking.
Many herds target roughly 45–55% of dam weight for weaned calves, but breed, age of dam, and milk level shift the range. Pair with the 205-day tool when ages differ widely.
Ratio percent is calf weight divided by dam weight, times 100.
ratio% = (calf_lb ÷ dam_lb) × 100
Calf weans at 550 lb, dam weighs 1,200 lb near weaning:
Ratio = 550 ÷ 1,200 × 100 = 45.8% of dam weight.
Assumptions: weights share the same shrink basis; dam weight is near weaning.
Limits: not a genetic evaluation; does not replace contemporary-group ratios or EPDs.
Responsibility: verify scale accuracy before ranking cows.
Stay consistent across the herd. Adjusted 205-day is fairer when ages differ; actual weight matches sale day.
Prefer a weight closest to weaning. Breeding-season weight is only a rough proxy.
Very high ratios can mean a light dam — check dam size and condition before selecting on percent alone.