Adjusted Scrotal Circumference (365 day)
When making bull selections for your operation, fertility is an important consideration. Scrotal circumference is not the only metric for evaluating reproductive ability, but it’s a valuable tool. Using an adjusted scrotal circumference calculator (365-day), like the one below, helps you gather standardized data for age and other factors—enabling you to make informed breeding decisions for your operation.
What is a good scrotal circumference for a bull?
What is the ideal size for a bull’s testicle?
Overall adjusted scrotal circumference is one of the most important metrics to have on hand for fertility decisions. However, symmetry is also crucial—testicles should be about the same size. If one testicle is significantly smaller than the other, it may indicate lower sperm production
Minimum scrotal circumferences, according to the Society for Theriogenology, are as follows:
Younger than 15 months: 30 cm
15-18 months: 31 cm
18-21 months: 32 cm
21-24 months: 33 cm
Older than 24 months: 34 cm
It’s also important to prioritize safety while gathering measurements. Make sure you restrain the bull in a squeeze chute so it can’t back up or kick you.
Does scrotal circumference in bulls have a 50% heritability?
Yes, studies have shown that scrotal circumference in bulls has high heritability from one generation to the next.
According to research from Ohio State, for every 1 centimeter increase in scrotal circumference over the population average, you could see a 0.25 increase in scrotal circumference in male offspring.
Check out the adjusted scrotal circumference calculator (365 days) above to start gathering data about your bulls’ reproductive potential.
Which bull appears to have the largest scrotal circumference?
Research has shown that Simmental bulls tend to have the largest adjusted scrotal circumference.
