drought kills grass you try to grow - you increase your pasturage to grow more animals, and then there are more to die off.
Control of the water and consistent supply to grow that grass would be the key to at least maintaining 1/3 the animals during prolonged droughts
BTW for all the Warmists, and ClimteChangeMongers — those droughts have been happening for thousands of years and wont be believed when you point at it in your usual fraudulent way ....
It is common here to sell off livestock in a drought when the pasturage isn’t sustaining the livestock you have-it is either that or buy hay to make up the difference-which is ruinously expensive-drought brings the price of cattle/beef down and inflates the price of a bale of hay to ridiculous levels, but that is how life in works in the world outside of cities where food comes from...