Adjusted Weaning Weight (205 day)
A calf’s adjusted weaning weight is its weight on the day it’s weaned, standardized to a certain age (205 days, for example). Weaning weights help producers measure the difference in calves’ growth potential, as well as the differences in dams’ milking ability.
How is weaning weight measured?
A calf’s regular weaning weight is simply its weight on the day it is weaned. However, this number must be standardized to enable easier and more precise comparisons and analysis.
Adjusted weaning weight (205 days) is measured by multiplying a calf’s average daily gain from birth to weaning by 205, then adding birth weight.
What is the formula for adjusted weaning weight?
You can use the adjusted weaning weight calculator above to get a precise number for your specific animals. But the general formula for adjusted weaning weight is:
205-Day Weaning Weight = Weaning Weight – Birth Weight / Age at Weaning in Days x 205 + Birth Weight
Other factors that can impact a calf’s weaning weight is its sex, plus the age of the dam. The Beef Improvement Federation publishes standard age-of-dam adjustments you can use in your calculations.
Why is adjusted weaning weight important?
Having accurate data about your calves’ adjusted weaning weights can help you:
- Determine which ones have the most growth potential
- Analyze feed efficiency
- Compare different members of your herd
- Make decisions on which lower-producing calves to sell
What is a good weaning weight?
There’s no hard and fast rule for what a successful adjusted weaning weight is. This number can be impacted by genetics, gender, environment, nutrition, and more.
In general, a weaned calf should be about 50% of its mother’s weight — which will usually be between 500 and 700 pounds.
Use the adjusted weaning weight calculator above to start comparing your calves’ growth potential.
