Effectiveness of on-farm continuous flow high-temperature short-time pasteurization for inactivation of bovine leukemia virus in milk.
Anim Sci J
; 91(1): e13495, 2020.
Article
em En
| MEDLINE
| ID: mdl-33372705
ABSTRACT
The effectiveness of on-farm continuous flow high-temperature short-time (HTST) pasteurization (i.e., 72°C for 15 s) for the inactivation of bovine leukemia virus (BLV) in milk was investigated with a sheep bioassay. Four sheep that had been inoculated with completely pasteurized milk containing approximately 3.4 × 107 BLV-infected peripheral blood mononuclear cells (PBMC) and treated by either HTST pasteurization or laboratory-scale low-temperature long-time (LTLT) pasteurization (i.e., 60°C for 30 min), remained negative for BLV for at least 17 weeks after inoculation. In contrast, all sheep inoculated with unpasteurized or inadequately pasteurized milk containing the same number of BLV-infected PBMC were tested positive for BLV and anti-BLV antibodies within 3 weeks after inoculation. These results suggest that on-farm continuous flow HTST pasteurization was equivalent value with inactivated BLV on the LTLT procedure and can effectively inactivate BLV in the milk. Therefore, on-farm HTST pasteurization of the pooled colostrum or milk used in automated feeding systems is likely to protect group-housed preweaned calves from BLV infection, thereby improving animal health on dairy farms.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Temperatura
/
Leucose Enzoótica Bovina
/
Vírus da Leucemia Bovina
/
Indústria de Laticínios
/
Inativação de Vírus
/
Leite
/
Pasteurização
/
Fazendas
/
Ração Animal
Limite:
Animals
Idioma:
En
Revista:
Anim Sci J
Assunto da revista:
MEDICINA VETERINARIA
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Japão