• Genomic Young Sires August 2023
To see your cows and heifers on these lists...
Guernsey PTI Formula
(Updated April 2020)
(6*(PL/2.4))+(3*(PTA Strength/0.9)) – (3*(PTA Stature/1.8))+(3*(LIV/2.3))
UDC and FLC should be rounded to the nearest 10th prior to use in the PTI formula
Udder Composite (UDC)
Foot & Leg Composite (FLC)
((.36*(RV/.42)) + (.48*(FA/.49)) – (.16*(RL/.65))) / 0.68
Requirements for appearing on genetic lists:
Active AI: bull must have semen available, recorded as Active with NAAB and be daughter-proven with a minimum amount of daughters on recorded test and classified.
Genomic young sires: bulls must be genomic tested with a valid Stud Code recorded at NAAB and NOT yet daughter-proven.
CPI/PTAT Cows: cows must have a calving recorded on DHI within the past 2 years, be purebred or GR, and scored GP-80 or higher.
CPI/PTAT Heifers: heifers must be under 2 years old and be purebred or GR.
Production recognition: cows must be purebred, GR, or PR. For Class Leaders, cows must meet a minimum requirement of test days.