PROGRESSIVE PERFORMANCE RANKING (introduced 2007)
The Brown Swiss Progressive Performance Ranking (PPR) is the ranking system for sire and cow genetic evaluations.
The formula has relative weights which add to 100 and, thus, are comparable to the percentage weight for each variable.
|
PPR Formula Relative Weights (Percentage)
|
| |
Protein |
Fat |
PL |
UDC |
MO |
DPR |
LIV |
SCS |
CCR |
HCR |
EFC |
| 2020 PPR |
30 |
22 |
8 |
10 |
6 |
16 |
4 |
4 |
|
|
|
| 2025 PPR |
26 |
26 |
8 |
10 |
6 |
8 |
4 |
4 |
4 |
2 |
2 |
The PPR Formula - April 2025
PPR = [26(PTAprotein/SDprotein) + 26(PTAfat/SDfat) + 10(PTAUDC/SDUDC) + 8(PTADPR/SDDPR) + 8(PTAPL/SDPL)
+ 6(PTAMO/SDMO) + 4(PTALIV/SDLIV) - 4(PTASCS-3.06/SDSCS) + 4(PTACCR/SDCCR) + 2(PTAHCR/SDHCR) + 2(PTAEFC/SDEFC) ]
where: SD = Standard Deviation of corresponding trait
| PPR Trait |
|
Standard Deviation (04/25) |
| Protein |
|
18.96 |
| Fat |
|
23.67 |
| UDC Udder Composite (see formula below) |
|
0.74 |
| DPR Daughter Pregnancy Rate |
|
2.51 |
| PL Productive Life |
|
2.65 |
| MO Mobility |
|
1.00 |
| LIV Livability |
|
2.03 |
| SCS Somatic Cell Score |
|
0.21 |
| CCR Cow Conception Rate |
|
2.85 |
| HCR Heifer Conception Rate |
|
2.59 |
| EFC Early First Calving |
|
2.75 |
Since the weights sum to 100, the divisor is (100/100) or 1.
Udder Composite
UDC Formula:
UDC = .14(PTAFUA/SDFUA) + .22(PTARUH/SDRUH) + .22(PTARUW/SDRUW) + .16(PTAUC/SDUC)
+ .10(PTAUD/SDUD) + .08(PTAFTP/SDFTP) + .04(PTARTP/SDRTP) + .04(PTATL/SDTL)
SD = Standard Deviation of Corresponding Trait
| UDC Trait |
Standard Deviation (04/25) |
| Fore Udder Attachment (FUA) |
1.0 |
| Rear Udder Height (RUH) |
0.9 |
| Rear Udder Width (RUW) |
0.8 |
| Udder Cleft (UC) |
0.8 |
| Udder Depth (UD) |
0.9 |
| Front Teat Placement (FTP) |
1.0 |
| Rear Teat Placement (RTP) |
1.0 |
| Teat Length (TL) |
1.3 |