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Effectiveness of on‐farm continuous flow high‐temperature short‐time pasteurization for inactivation of bovine leukemia virus in milk
Author(s) -
Tomita Keisuke,
Miyauchi Sonoko,
Katagiri Yuzuru,
Yoneyama Syuji,
Dongze Leng,
Chiba Yusuke,
Hirata TohIchi,
Ichijo Toshihiro,
Yasuda Hajime A.,
Hikono Hirokazu,
Murakami Kenji
Publication year - 2020
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.13495
Subject(s) - pasteurization , bovine leukemia virus , inoculation , colostrum , food science , biology , virology , virus , zoology , chemistry , antibody , immunology
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 × 10 7 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.