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If someone starts out with one male and three females, they will have around 10-20 to slaughter in 3 months. Save acouple females and you will have 5 breeders in less than 6 months etc. It just makes sense (and cents)!

Very true!
And in times when food is scarce, they can be a valuable bartering tool.
If you want it known that you have food to barter... :/