Table 2.
Assumptions and inputs used in the partial budget model to evaluate the economic benefit of using Rumensin Controlled Release Capsule (CRC) to reduce disease incidence and increase milk production. Value listed for each clinical disease is the percentage by which CRC can reduce it whereas values in parentheses are the median incidences used as a default input for each disease in the model
| Item | Value | Reference |
|---|---|---|
| Effect of using CRC on disease reduction | ||
| Metritis | 16% (16.7%) | 17 |
| Ketosis | 50% (40%) | 20 |
| Mastitis | 9% (40%) | 17 |
| Clinical ketosis | 25% (9.6%) | 17 |
| Retained placenta | 8% (16.7%) | 17 |
| Displaced abomasum | 25% (4.8%) | 17 |
| Effect of using CRC on milk production | ||
| Increase production in BCS = 3.25 to 3.75a | 0.85 kg/d | 15 |
| Increase production in BCS ≥ 4b | 1.2 kg/d | 15 |
| Time period milk is increased | 90 days | 15 |
| Price of 1 bolus of CRC | $18 | |
| Milk price | $0.81 | 21 |
| Dairy efficiencyc | 2.3 | |
| Cost of 1 kg of TMR (dry matter basis) | $0.3 | 22 |
| Labor wages/h | $15 | 23 |
| CRC boluses administered/h | 15 | |
Cows with BCS between 3.25 and 3.75 are assumed to be 65% of the lactating animals in the default inputs used to build the partial budget model.
Cows with BCS ≥ 4 are assumed to be 10% of the lactating animals in the default inputs used to build the partial budget model.
Milk yield (kg) produced as a result of a cow consuming 1 additional kg of dry matter above maintenance requirements (24); this calculation accounts only for the concentration of energy required to produce marginal milk after considering a NEL 0.75 Mcal/kg of 4% milk and 1.73 Mcal/kg of feed in dry matter basis (25).