Pick 2–6 candidate rams. We run a 1,000-progeny Monte Carlo per ram against your ewe flock, project flock NPI at year 3, 5 and 10 with P10/P90 fan, estimate inbreeding rise, and solve for the optimal contribution mix that maximises expected gain under your ΔF constraint.
1. Select candidate rams
Pick from your existing ram catalogue, or drop a new EBV file (Sheep Genetics ASBV format). Tick the box on each ram you want to compare.
Tag
Name
Breed
Flock
Genomic
Source
Loading rams…
Drop a ram catalogue — Excel, CSV or PDF — to add more candidates
2. Simulation settings
Ram Impact Simulation
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3. Flock NPI trajectory under each ram
P10 / median / P90 fan over horizon. Wider fan = more uncertainty (low-accuracy ram or high Mendelian sampling).
4. Ram comparison
Sorted by median Δ$/ewe at the longest horizon. P10 is the downside scenario — what if Mendelian sampling lands badly.
Ram
Breed
Suit
Δ$/ewe P10
Δ$/ewe P50
Δ$/ewe P90
Flock total $ P50
ΔF / gen
Discounted NPV
5. Optimal contribution mix
Meuwissen 1997 — projected-gradient solution. Maximises expected gain subject to your ΔF cap. Larger flocks reach the cap faster, so the optimal mix shifts towards diversification.
6. Per-trait shift in progeny
Mean EBV shift in next-generation progeny vs current flock mean — the genetic direction each ram pulls the flock in.