Scrotal circumference measurements taken on bulls between 300 and 700 days of age are used to calculate Scrotal Size EBVs within the TransTasman Angus Cattle Evaluation (TACE).
Recording scrotal circumference measurements
Scrotal circumference measurements should be recorded by pulling the testes firmly down into the lower part of the scrotum and placing a measuring tape around the widest point (as per the photo below). Scrotal circumference measurements can be taken by anyone. They do not need to be taken by an accredited technician.
When measuring scrotal circumference, remember:
A variety of scrotal circumference measuring devices are commercially available from agricultural supply stores or organisations such as the Australian Cattle Veterinarians. Metal scrotal measuring tapes are more reliable than cloth tapes as they are not prone to stretching.
When should scrotal circumference measurements be collected?
TACE can analyse scrotal circumference information from bulls that are between 300 – 700 days of age when measured. Subsequently, it is essential that scrotal circumference information is recorded when bulls are within this age range.
It is recommended that scrotal circumference is measured when bulls are reaching puberty, which will vary according to seasonal conditions and the maturity pattern of the animals being measured. In the majority of cases, the optimum time to record scrotal circumference measurements for TACE is when bulls are being weighed at 400 days.