The Curley Calf Syndrome is tentatively being traced to GAR Precision 1680 or his
ancestors.
The following statement was made by Dr. Laurence Denholm
of New SouthWales, Australia
The only reason this particular curly calf defect has come to be recognized
now is that the identified suspect carrier bull, Precision 1680, had so many
powerful positive carcass performance traits which Angus breeders recognized and
wanted to maximize in their own cattle. Breeders all over the world used his semen
very heavily indeed, in order to capture those carcass performance benefits, and
thereby increased the prevalence of his particular defective gene/s in the
population.
Look at 1680's pedigree
While it is commonly stated that Rito N Bar is the original source of the Rito family, the great Rito Family Bloodline finds its most concentrated origin in the year 1940 with the birth of Eliminator 5 of Bordulac.
Rito N Bar, born March 17, 1960, is linebred 4 times to Blackcap Revolution through his sire, Eliminator 302.
Eliminator 302 is linebred 2 times to Eliminator 5 of Bordulac, born April 26, 1940.
Eliminator 5 of Bordulac is linebred twice on both sides of his pedigree (4 times) to Blackcap Revolution who is linebred twice through Formosa of Portlethen, born May 7, 1865 to Duke of Wellington AAA Registration No. 294
. Rito N Bar is the sire of RR Rito 707. RR Rito 707 is linebred 8 more times through his dam to Blackcap Revolution, for a total of 12 times.
RR Rito 707 is the sire of Rito 707 of Ideal 533 70, who is the maternal grandsire of Band 234 of Ideal 3163, better known as The Band 105 Bull.
The Band 105 Bull is without question one of the most influential progenitors of the Rito Blood.
BAND 602 OF IDEAL 928 72 is the sire of BAND 234 OF IDEAL 3163
BAND 602 OF IDEAL 928 72 is also on the dam side of 1680
So there is a lot of line breeding to get a gene with a defect