https://www.backyardchickens.com/t/375288/swedish-flower-hen-thread/7950#post_12930222
Post 7965 reads:
"Some breeds have been bred crest to crest for hundreds of years and have adapted.
There is a
known issue with breeding crested SFH to crested SFH - high mortality, vaulted skulls, inability to hatch...
Did I state that the chicks from crested x crested pairings WILL die in the shell or shortly after hatch and present this as an absolute fact, or did I say "There is a known issue?" These two phrases are NOT the same thing. "A known issue" means there is a history of problems. It does not mean ALL birds die in the shell or shortly after birth.
Post 7965 continues:
"Every breed is different and has evolved differently. In the southern regions of Sweden, farms had mostly uncrested birds. Other regions to the north had primarily crested birds.
We can assume a certain amount of evolutions in those regions that kept primarily crested birds... and that birds from regions that kept primarily uncrested birds
would likely have different genetics.
Thus, it is likely that the most fatal of crosses result from breeding crested birds to heterozygous crested birds with a primarily uncrested lineage who have not had time to evolve to the point of lower mortality rates from homozygous crests.
Long story short... a Swedish Flower Hen is not a Silkie or a Polish. Just because one can breed other breeds to have heterozygous genetics for crests does not mean the same can be applied to a breed where at least half the gene pool is not meant to be crested."
Please note the verbiage specifically designed to indicate that a THEORY is being discussed... I have put them in BOLD for your reading pleasure. So, ancientoaks, no - you are not reading it correctly if you take these words as statements of absolute facts.
Thank you.