Table showing full year results for each year from 2013 to 2020, plus results for 2021 to the date/week shown. The corresponding 2020 and 2021 data of the same week is also shown for comparison.
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24/02/21 |
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2013
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2014
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2015
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2016 |
2017 |
2018 |
2019 |
2020 |
2020
Week 8 |
2021
Week 8 |
Calves Tested |
2,095,878 |
2,131,966 |
2,264,865 |
2,325,260 |
2,347,558 |
2,347,232 |
2,343,970 |
2,372,777 |
519,054 |
522,165 |
% Negative |
98.03% |
98.54% |
98.85% |
99.20% |
98.85% |
98.58% |
98.96% |
99.10% |
99.16% |
99.22% |
% (Number) Positive* |
0.77% (16,192) |
0.50% (10,758) |
0.36% (8,246) |
0.20% (4,540) |
0.12% (2,843) |
0.07% (1,531) |
0.05% (1,111) |
0.03% (803) |
0.03% (139) |
0.02% (117) |
% (Number) Inconclusive* |
0.03% (661) |
0.01% (119) |
0.01% (207) |
0.00% (59) |
0.01% (118) |
0.00% (47) |
0.00% (15) |
0.00% (15) |
0.00% (0) |
0.00% (0) |
% (Number) Empty |
1.13% (23,751) |
0.92% (19,676) |
0.73% (16,637) |
0.59% (13,720) |
1.01% (23,714) |
1.33% (31,128) |
0.94% (22,074) |
0.81% (19,300) |
0.79% (4,094) |
0.75% (3,897) |
% (Number) PI** |
0.66% (13,877) |
0.46% (9,733) |
0.33% (7,427) |
0.16% (3,808) |
0.1% (2,397) |
0.06% (1,325) |
0.04% (987) |
0.03% (719) |
0.03% (133) |
0.02% (117) |
% (Number) PI** recorded dead |
100% (13,876) |
100% (9,733) |
100% (7,427) |
100% (3,808) |
100% (2,397) |
100% (1,325) |
100% (987) |
100% (719) |
43.6% (58) |
62.4% (73) |
% (Number) of positive herds |
11.27% (9,484) |
7.63% (6,191) |
5.9% (4,770) |
3.25% (2,549) |
2.03% (1,613) |
1.13% (865) |
0.78% (571) |
0.55% (397) |
0.29% (92) |
0.22% (67) |
% (Number) of herds retaining one or more PI** calves born in stated year alive for more than 7 weeks (2013-2016), 5 weeks (2017 and 2018) or 3 weeks (2019) after the date of the first test
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0.00% (0) |
0.00% (0) |
0.00% (0) |
0.00% (0) |
0.00% (0) |
0.00% (0) |
0.00% (0) |
0.00% (0) |
0.00% (1) |
0.00% (0) |
No. of herds with Negative Herd Status |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
77,456 |
79,100 |
*Based on initial tag test result, prior to any confirmatory testing
**Calves with an initial positive or inconclusive result without a negative retest result
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Click on the image to view maps of the number and distribution of PI animals born each year 
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Click on the image to view a map of the number and distribution of BVD-positive animals that are still alive |
Click on the image to view a map of the number and distribution of BVD-positive animals that are currently retained (alive more than 3 weeks after their initial test) |