Guernsey PTI Formula

(Updated December 2018)

(25*(PTAP/18))+(25*(PTAF/25))+ (15*(DPR/2.3))+(10*(UDC/.90))+(10*(FLC/1.03))+

(9*(PL/2.4))+(3*(PTA Strength/0.9)) – (3*(PTA Stature/1.8))

UDC and FLC should be rounded to the nearest 10th prior to use in the PTI formula

Udder Composite (UDC)

(.15*(FU/1.33))+(.15*(RH/1.24))+(.05*(RW/1.22))+(.15*(UC/.84))+(.33*(UD/1.53))+(.15*(TP/1.05))-(.02*(TL/1.11)) /0.71

Foot & Leg Composite (FLC)

(.36*(RV/.42)) + (.48*(FA/.49)) – (.16*(RL/.65)) / 0.68

To see your cows and heifers on these lists...

The American Guernsey Association

1224 Alton Darby Creek Rd., Suite G | Columbus OH 43228 | Tel: (614)864-2409 | Fax: (614)864-5614 | Email: info@usguernsey.com

© 2017 American Guernsey Association. 

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