Handling fractures in calves for best outcome

A calf at Margaret Riungu's dairy farm in Meru. [Olivia Murithi, Standard]

Dear Daktari, thank you so much for your informative column on matters of livestock health. I am an upcoming dairy farmer in Nandi County. I have several calves on my farm, and recently one of them fractured one of its hindlegs. What I did not understand is how this happened considering that the affected calve was only a few weeks old and was confined most of the time. A cast was applied, and the calf healed fast. My question is, what could have caused the fracture? Could it have occurred during delivery?