Oh, okay. It was the way it was worded that confused me for a minute.Many breeders,inbred animals.
Animals that are related by blood have bad genetics.
Such animals are not resistant to diseases, they give bad results in offspring...
Regular introduction of other genetics into the herd strengthens the genetics of the herd and such animals give the best results.
It's hard for me to explain through Google translator, but it's bad, for example, when we mate a brother and a sister, a cousin and a cousin...so we repeat these actions by changing partners in the herd, without introducing a new animal with a different genetic line.
Unfortunately, this is what many breeders do in order to save money and make quick money.
I know about that.