Table 6.
Loss from replacement on a farm with 60 head of cattle.
| 60-Head Cattle Farm | |||||||
|---|---|---|---|---|---|---|---|
| Number of test-positive animals | 0 | 1 | 2 | 3 | 4 | 5 | 10 |
| Number of cows on farm | 60 | 60 | 60 | 60 | 60 | 60 | 60 |
| Number of cows to be slaughtered due to tuberculosis (TB) | 0 | 1 | 2 | 3 | 4 | 5 | 10 |
| Number of productive cows | 60 | 59 | 58 | 57 | 56 | 55 | 50 |
| Production considering fertility and mortality at birth * | 45 | 44 | 43 | 42 | 42 | 41 | 37 |
| Male calves | 22 | 22 | 22 | 21 | 21 | 20 | 19 |
| Female calves | 23 | 22 | 21 | 21 | 21 | 21 | 18 |
| Yearly replacement | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Increased replacement due to TB | 1 | 2 | 3 | 4 | 5 | 10 | |
| Number of male calves sold | 22 | 22 | 22 | 21 | 21 | 20 | 19 |
| Sale price of male calves | 676.97 | 676.97 | 676.97 | 676.97 | 676.97 | 676.97 | 676.97 |
| Number of female calves sold ** | 15 | 13 | 11 | 10 | 9 | 8 | 0 |
| Sale price of female calves | 458.1 | 458.1 | 458.1 | 458.1 | 458.1 | 458.1 | 458.1 |
| Sales revenue | 21,764.8 | 20,848.6 | 19,932.4 | 18,797.4 | 18,339.3 | 17,204.2 | 12,862.4 |
| Annual reduction in sales revenue *** | −916.20 | −1.832,40 | −2967.47 | −3425.57 | −4560.64 | −8902.41 | |
| Reduction in sales revenue over two and a half years **** | −2290.50 | −4581.00 | −7418.67 | −8563.93 | −11,401.60 | −22,256.03 | |
* (Number of productive cows × (9/11.5)) − ((Number of productive cows × 9/11.5) × 0.05); ** Number of female calves sold = Female calves − Yearly replacement − Increased replacement due to TB; *** Annual reduction in sales revenue (for n test-positive animals) = Sales revenue for n test-positive animals scenario − Sales revenue for 0 test-positive animals scenario; **** Reduction in sales revenue over two and a half years = Annual reduction in sales revenue × 2.5 years.