However, this can vary depending on a number of factors such as:
* Breeding: Cows that are actively bred tend to have shorter lifespans due to the physical demands of pregnancy and lactation.
* Nutrition: Good nutrition and health care can extend a cow's lifespan.
* Environment: Harsh environments with limited resources can shorten lifespan.
* Genetics: Individual cows may have genetic predispositions to certain diseases or health issues that can affect their lifespan.
It's important to note that these are just estimates, and there are always exceptions. Some Droughtmaster cows may live longer than 15 years, while others may live shorter lives.