10/09/2026
Protecting bull fertility starts well before joining.
A bull might look fit, sound and ready to work but what happens in the weeks leading up to joining can have a significant impact on his fertility.
Drawing on more than 40 years working in bovine reproduction, Ced recently spoke with The Land about of the factors producers should consider when managing their bulls for joining.
Stress is one of the biggest.
Yard handling, vaccination, transport, nutrition and heat can all place additional stress on bulls. As Ced explains, increased cortisol associated with stress can lower testosterone, while a significant insult to the testicles can affect s***m production for more than two months.
Even routine management needs to be considered. Timing vaccinations and other procedures to give bulls adequate time to recover before joining can make a difference.
Heat is another major consideration. S***m production relies on the testicles remaining cooler than core body temperature, meaning extreme temperatures, limited shade and radiant heat from bare ground can all put fertility at risk.
For producers, the message is simple: protect the investment you’ve made in your bulls.
✔️ Minimise unnecessary stress
✔️ Plan vaccinations and handling well ahead of joining
✔️ Manage transport carefully
✔️ Maintain adequate nutrition
✔️ Provide access to shade and ground cover
✔️ Allow bulls adequate recovery time before joining
Every bull has a job to do, and good management before joining gives him the best opportunity to do it.
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