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January 2010 elite cow and heifer statistics
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Determination of elite or high-ranking grade status was based on a
two-stage screening procedure. The first-stage screening criteria for
eligibility were:
- Management groups included lactations of at least three other cows
when averaged across a cow's lactations.
- Last calving was within 2 years and 3 months of current evaluation date.
- Last record was either in progress (code R) or had a termination
code of 0 (blank), 1, 2, or 8.
- First lactation was not predominantly owner-sampler type of
test.
- Reliability of milk evaluation was at least 30%.
OR
- The animal includes genomic evaluation information
Summary information for eligible (those passing first-stage screening)
registered cows are in Table 1.
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Table 1. Mean predicted transmitting abilities
(PTAs) for milk, fat, protein, productive life (PL), somatic cell score (SCS),
and net merit (NM) for registered1 cows passing first-stage screening.
| 7,383 |
32 |
32 |
0.8 |
-0.0 |
2.98 |
0.7 |
0.93 |
| 18,991 |
33 |
-28 |
-0.2 |
-0.7 |
2.98 |
0.7 |
2.51 |
| 3,472 |
61 |
-5 |
-0.1 |
-0.0 |
2.96 |
1.2 |
3.42 |
| 571,533 |
34 |
-39 |
0.4 |
-0.5 |
2.97 |
0.6 |
-1.68 |
| 152,571 |
27 |
-11 |
1.3 |
-0.3 |
2.99 |
0.6 |
0.82 |
| 3,518 |
52 |
211 |
8.4 |
6.1 |
3.01 |
0.1 |
2.16 |
| 1,526 |
-71 |
-653 |
-13.6 |
-16.4 |
3.00 |
0.6 |
5.19 |
1Includes cows in an identity enrollment program for some breeds.
2Includes genomically evaluated heifers
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Table 2.
Standard deviations of PTAs for milk, fat, protein, PL, SCS, and NM for registered1
cows passing first-stage screening.
| 7,383 |
+/- 135 |
+/- 496 |
+/- 18 |
+/- 14 |
+/- 0.13 |
+/- 1.6 |
+/- 7.3 |
| 18,991 |
+/- 170 |
+/- 512 |
+/- 19 |
+/- 15 |
+/- 0.12 |
+/- 2.3 |
+/- 9.7 |
| 3,472 |
+/- 164 |
+/- 605 |
+/- 22 |
+/- 17 |
+/- 0.15 |
+/- 2.1 |
+/- 9.9 |
| 571,533 |
+/- 169 |
+/- 697 |
+/- 25 |
+/- 19 |
+/- 0.14 |
+/- 1.5 |
+/- 9.8 |
| 152,571 |
+/- 147 |
+/- 614 |
+/- 24 |
+/- 18 |
+/- 0.11 |
+/- 1.4 |
+/- 7.4 |
| 3,518 |
+/- 147 |
+/- 574 |
+/- 22 |
+/- 17 |
+/- 0.13 |
+/- 1.4 |
+/- 6.7 |
| 1,526 |
+/- 140 |
+/- 685 |
+/- 23 |
+/- 18 |
+/- 0.12 |
+/- 1.2 |
+/- 10 |
1Includes cows in an identity enrollment program for some breeds.
2Includes genomically evaluated heifers
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For registered eligible cows, a percentile table for each breed was
constructed based on NM. Those percentile tables are provided with USDA-DHIA
evaluations for active artificial-insemination bulls. A percentile was assigned for each cow with
data distributed in format 105. Although the data for Red and White cows are
combined with those for Holstein cows for genetic evaluations, a separate
percentile was used for screening Red and White cows
for elite or high-ranking grade status. The second-stage screening criterion was the
NM corresponding to a specified minimum percentile (Table 3).
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Table 3.
Percentiles and corresponding NM for a cow to be designated as elite or a high-ranking grade and numbers by breed.
| 98 |
322 |
146 |
2,311 |
| 98 |
376 |
373 |
666 |
| 98 |
413 |
68 |
198 |
| 99 |
438 |
7,707 |
6,552 |
| 99 |
343 |
1,525 |
2,095 |
| 97 |
339 |
104 |
332 |
| 97 |
184 |
383 |
85 |
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