Options for the eradication of bovine leukemia virus infection in dairy cattle
The article presents options of the control of bovine leukemia virus infection in dairy cattle depending on the character of the epizootic situation and economic opportunities of agricultural enterprises. When the within-herd BLV prevalence in breeding stock ranges from 2.5% to 10% it is recommended...
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| Format: | Article |
| Language: | Russian |
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Federal Agricultural Research Center of the North-East named N.V. Rudnitsky
2016-12-01
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| Series: | Аграрная наука Евро-Северо-Востока |
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| Online Access: | https://www.agronauka-sv.ru/jour/article/view/84 |
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| author | Y. P. Smirnov I. L. Suvorova N. A. Gryazeva |
| author_facet | Y. P. Smirnov I. L. Suvorova N. A. Gryazeva |
| author_sort | Y. P. Smirnov |
| collection | DOAJ |
| description | The article presents options of the control of bovine leukemia virus infection in dairy cattle depending on the character of the epizootic situation and economic opportunities of agricultural enterprises. When the within-herd BLV prevalence in breeding stock ranges from 2.5% to 10% it is recommended to slaughter all infected animals and to test all seronegative animals with 1-3 month intervals which should be slaughtered until the results of last two successive serological examinations are negative. When the within-herd BLV prevalence ranged from 10 to 30-40% all infected animals should be isolated by grouping them in separate groups; sick animals should be culled and slaughtered. Seronegative animals were tested serologically every three months; when the BLV prevalence decreases to 1% serological testing was carried out monthly. Seropositive cows should be replaced by seronegative heifers. The herd can achieve BLV free status in 4-4.5 years. When the within-herd BLV prevalence was more than 40% all animals was tested haematologically every 6 months, seropositive heifers were selected for fattening. Seronegative heifers were used for replacement of seropositive animals in large farms. Seronegative cows were isolated from seroreagents by grouping them in a separated area of the same barn. The herd can be given official BLV-free status in 1-1.5 years if testing intervals in 1-3 months are respected. When economic opportunities allowed it was recommended to eliminate the livestock and to replace it by animals imported from BLV-free farms. The effectiveness of eradication programme can be improved when using highly sensitive methods of diagnostics of leukemia polymerase chain reaction (PCR) and enzyme-linked immunosorbent assay (ELISA) and biologically active substances with immunomodulating activity (T- and B-activins, Ligfol, phosprenil and others). |
| format | Article |
| id | doaj-art-fd9ca941a4d74c93b99a9f6a77f554ce |
| institution | Matheson Library |
| issn | 2072-9081 2500-1396 |
| language | Russian |
| publishDate | 2016-12-01 |
| publisher | Federal Agricultural Research Center of the North-East named N.V. Rudnitsky |
| record_format | Article |
| series | Аграрная наука Евро-Северо-Востока |
| spelling | doaj-art-fd9ca941a4d74c93b99a9f6a77f554ce2025-08-03T19:52:33ZrusFederal Agricultural Research Center of the North-East named N.V. RudnitskyАграрная наука Евро-Северо-Востока2072-90812500-13962016-12-0106424783Options for the eradication of bovine leukemia virus infection in dairy cattleY. P. Smirnov0I. L. Suvorova1N. A. Gryazeva2Research Veterinary Institute of the Non-Chernozem Zone of the Russian FederationResearch Veterinary Institute of the Non-Chernozem Zone of the Russian FederationKirov regional veterinary laboratoryThe article presents options of the control of bovine leukemia virus infection in dairy cattle depending on the character of the epizootic situation and economic opportunities of agricultural enterprises. When the within-herd BLV prevalence in breeding stock ranges from 2.5% to 10% it is recommended to slaughter all infected animals and to test all seronegative animals with 1-3 month intervals which should be slaughtered until the results of last two successive serological examinations are negative. When the within-herd BLV prevalence ranged from 10 to 30-40% all infected animals should be isolated by grouping them in separate groups; sick animals should be culled and slaughtered. Seronegative animals were tested serologically every three months; when the BLV prevalence decreases to 1% serological testing was carried out monthly. Seropositive cows should be replaced by seronegative heifers. The herd can achieve BLV free status in 4-4.5 years. When the within-herd BLV prevalence was more than 40% all animals was tested haematologically every 6 months, seropositive heifers were selected for fattening. Seronegative heifers were used for replacement of seropositive animals in large farms. Seronegative cows were isolated from seroreagents by grouping them in a separated area of the same barn. The herd can be given official BLV-free status in 1-1.5 years if testing intervals in 1-3 months are respected. When economic opportunities allowed it was recommended to eliminate the livestock and to replace it by animals imported from BLV-free farms. The effectiveness of eradication programme can be improved when using highly sensitive methods of diagnostics of leukemia polymerase chain reaction (PCR) and enzyme-linked immunosorbent assay (ELISA) and biologically active substances with immunomodulating activity (T- and B-activins, Ligfol, phosprenil and others).https://www.agronauka-sv.ru/jour/article/view/84cattlebovine leukemiabovine leukemia virus (blv)options for the control bovine virus infection |
| spellingShingle | Y. P. Smirnov I. L. Suvorova N. A. Gryazeva Options for the eradication of bovine leukemia virus infection in dairy cattle Аграрная наука Евро-Северо-Востока cattle bovine leukemia bovine leukemia virus (blv) options for the control bovine virus infection |
| title | Options for the eradication of bovine leukemia virus infection in dairy cattle |
| title_full | Options for the eradication of bovine leukemia virus infection in dairy cattle |
| title_fullStr | Options for the eradication of bovine leukemia virus infection in dairy cattle |
| title_full_unstemmed | Options for the eradication of bovine leukemia virus infection in dairy cattle |
| title_short | Options for the eradication of bovine leukemia virus infection in dairy cattle |
| title_sort | options for the eradication of bovine leukemia virus infection in dairy cattle |
| topic | cattle bovine leukemia bovine leukemia virus (blv) options for the control bovine virus infection |
| url | https://www.agronauka-sv.ru/jour/article/view/84 |
| work_keys_str_mv | AT ypsmirnov optionsfortheeradicationofbovineleukemiavirusinfectionindairycattle AT ilsuvorova optionsfortheeradicationofbovineleukemiavirusinfectionindairycattle AT nagryazeva optionsfortheeradicationofbovineleukemiavirusinfectionindairycattle |