Table 2.
Bovine leukemia virus (BLV) antibody testing schedule and results for Herd R.
| Test Date | Test Type | Description | Results1 |
|---|---|---|---|
| July 2015 | Herd (milk) | All cows in the milking herd | 27/849 (3.2%) |
| September 2015 | Interim (milk) | Cows dry at July test and 1st lactation heifers2,3,4 | 5/136 |
| February 2016 | Herd (milk) | All cows in the milking herd2,5 | 31/844 (3.7%) |
| May 2016 | Interim (milk) | Test of 1st lactation heifers2,6 | 22/218 |
| August 2016 | Herd (milk) | All cows in the milking herd2,7 | 46/849 (5.4%) |
1 BLV-antibody positive (“positive”) over total tested, with point prevalence (%) for herd tests.
2 Heifers had comingled with animals from other herds at the out-of-state calf-raising facility.
3 All five (5) positive animals were 1st lactation heifers.
4 Excludes one (1) cow tested in July 2015 that was inadvertently re-tested in September.
5 Five (5) positive cows were new infections in previously negative animals, fourteen (14) were 1st lactation heifers, and twelve (12) were previously positive animals.
6 Includes ninety-four (94) 1st lactation heifers previously tested in February, eleven (11) of which were positive at that time.
7 Seven (7) positive cows were new infections in previously negative animals, nine (9) were 1st lactation heifers, and thirty (30) were previously positive animals.