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I also prefer having heritage breeds on the property for their personality and the color they bring to the fabric of life. I love my RIR and especially the BRs we keep.
That said, none of them hold a candle to the ISA for early lay, (16 weeks vs. 22 weeks) size of egg, feed conversion and sheer production. The RIR and BRs we have lay 280 eggs a year, which is outstanding, but the ISA lays 330+.
But again, the ISA is NOT a breed. It is a hybrid. F!, first generation, non sustainable hybrids. They are also not dual purpose. There is very little flesh on their bodies, really.
We have both traditional breeds and ISAs and production birds for the egg business. Each have their place and purpose.