Live weights taken on calves when the average age of the contemporary group is between 80 and 300 days of age are used to calculate both 200 Day Growth EBVs and Milk EBVs within the TransTasman Angus Cattle Evaluation (TACE).
Recording 200 day weights
All weights should be recorded using appropriate (and accurate) scales. Do not guess/estimate weight or use measuring tapes to calculate weight. Either weigh the calves using appropriate scales or don’t record weights. Weights should be recorded to the nearest kilogram.
When should 200 day weights be collected?
The 200 day weight for a calf needs to be recorded when the average age of their contemporary group is between 80 and 300 days of age.
Within this age range, a date should be chosen that fits in with normal, routine management practices (e.g. weaning) and is reasonably close to when the average age of the group of calves is 200 days of age. TACE provides suggested weigh dates to assist you when making this decision.
If particularly looking to optimise the quality of Milk EBVs, 200 day weights should be collected at or before weaning. Likewise, if a significant number of cows have weaned calves naturally (i.e. have “dried off”) before the calves are “physically” weaned, then it may be beneficial to consider taking an early weight on all calves.
Calves do not need to be weighed when they are all individually 200 days of age on the day of weighing, but rather the whole contemporary group weighed when the average age of the group is approximately 200 days (i.e. 6 – 7 months).