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. 2015 Jan 16;68(1):1. doi: 10.1186/s13620-014-0029-7

Table 1.

Veterinary farm visits to sick calves, antibiotic spend and number of calvings on a farm with ten cattle persistently infected (PI) with BVD virus

21st Sept. 2009- 6 th July 2010 (A*) 21st Sept. 2010- 6th July 2011 (B**) 1 Percentage increase/decrease
Calvings (number) 82 115 40
Vet. calls to sick calves (number) 12 10 −17
Total antibiotic spend (€) 1302 696 −47
Antibiotic spend on calves (€) 972 637 −34

1The percentage increase/decrease between the period when PI cattle were born and were present on the farm until slaughter and the corresponding period twelve months later. ((A-B) ÷ A) × 100. *Period of time that ten PI cattle were born and present on the farm until slaughter. **Corresponding period twelve months later.