I already had the opportunity to talk about it with old farmers who saw animal traction used: cows were more economical than horses and beef
explanation found later: horses are not ruminants, therefore benefit less from grass than cows ... therefore horses eat more than cows for the same work
beef is more complicated to handle and is useless when it is no longer needed ... cows are useful all year round for making milk and even more useful for making calves
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