CSC Transition & Fertility Outcomes Model

Farm inputs

Adoption within targeted bands 100%

Not every eligible cow gets dosed. This covers missed cows within the age groups you tick "Treat" for below — it doesn't touch untargeted groups.

CSC clinical milk fever efficacy 85%

Lawlor et al. 2024: 0% clinical MF in supplemented cows vs 13.3% control.

CSC subclinical hypocalcaemia efficacy 95%

Sustained blood Ca 2.14 vs 1.98 mmol/L over 96h (Lawlor et al. 2024).

Link downstream risk reductions to the efficacy sliders above

On: retained placenta and metritis move with subclinical efficacy (they're driven by the SCH pool CSC keeps down); transition deaths and premature culling move with clinical efficacy (they track the acute clinical event). Drop either slider to 0% and its linked outcomes drop to 0% too — no free-standing disease reduction with no calcium effect behind it. Off: treat every entry below as independent published evidence for that specific disease, unlinked from either efficacy slider.

Age group	Cows	Clinical MF risk %	Subclinical risk %	Treat?
Total	—

Age-specific subclinical rates: Roberts & McDougall 2018 (NZ Vet J. 67:1-20). Heifers are defaulted to untreated — dosing 1st-calvers with a sustained-release bolus isn't typically recommended. Edit any cell or tick directly — nothing here gets silently rescaled.

1Transition period losses

What hypocalcaemia costs the herd in the first days after calving — before a single mating decision is made.

2Breeding gains

Cycling, submission and conception downstream of a smoother transition. Cycling and submission are leading indicators — the empty rate below is where they land financially.

The "With CSC" figures below are whole-herd averages, weighted by how much of the herd is actually treated — not the rate among treated cows alone. At partial coverage the herd-wide number will sit between baseline and the treated-cow rate.

3Production

Response expressed as a % lift on the herd's own average production, matching the spread actually seen across trials rather than a fixed L/day.

Herd average production, kg MS/cow/season 420

Response scenario

Custom lift, % of production 4.5%

—

Estimated gain in treated cows — assumes each completes a full season at the selected % lift, with no allowance for a partial or declining response.

✓Summary

The headline outcomes above, together, before they're translated into dollars.

What this is worth — dollar translation (optional)click to expand

Outcome	Quantity	Value per unit	Value
Total benefit			$0

Subclinical hypocalcaemia is shown as an outcome above but not costed here — its financial impact is mostly captured through retained placenta, metritis, culling and production, all of which are driven off it. First service conception and 6-week in-calf rate aren't costed here either, even though Pihama showed a real effect on them — that gain lands in next season's calving pattern and days in milk, not this season's numbers, so it's left out of this season's total below.

Programme cost

Total benefit

Net gain

ROI

0 : 1

Defaults reflect Froger, Stiegeler & Lawlor 2026 (J. Vet. Anim. Sci.), Lawlor et al. 2024 (Anim. Vet. Sci. 12(6):154-160), Pihama and Hakatere trial data, and Roberts & McDougall 2018 age-specific risk. Every number above is editable — the model runs on your farm's assumptions, not a fixed marketing claim.