Open Access

Table 4.

Schemes for immunizing cows before infection

Scheme / Number of cows Vaccination scheme (Age, strain, vaccination)
3‐6 months old 18‐20 months old After 1st calving
1st / 5 19 19 19*
2nd / 5 19 19* 19*
3rd / 5 19 82 82
4th / 5 19 82 82*
5th / 4 82 82 82
6th / 5 82 82 82*
7th /3 control

Note: * a small dose of the vaccine from strain 82 10 bln m.c., vaccine from strain 19 3 bln m.c.

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