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[Flock Action] Rank Animals — 12 Katahdin sheep #2

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13 changes: 13 additions & 0 deletions reports/2026-02-07-rank-animals/data.csv
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rank,lpn_id,gender,dob,score,BWT_value,BWT_accuracy,BWT_contribution,WWT_value,WWT_accuracy,WWT_contribution,YWT_value,YWT_accuracy,YWT_contribution,PWWT_value,PWWT_accuracy,PWWT_contribution,NLB_value,NLB_accuracy,NLB_contribution
1,6401492025FLE087,Female,2025-03-02,11.91,0.352,63,-0.222,3.069,61,3.744,5.726,53,4.552,5.898,64,3.775,0.132,44,0.058
2,6401492020FLE249,Female,2020-02-05,10.92,0.243,74,-0.180,3.039,71,4.315,3.550,63,3.355,4.611,73,3.366,0.116,57,0.066
3,6401492025FLE082,Female,2025-02-28,9.95,0.334,65,-0.217,2.694,63,3.394,4.383,55,3.616,4.784,65,3.110,0.113,45,0.051
4,6401492025FLE047,Female,2025-02-24,9.89,0.432,59,-0.255,2.948,57,3.361,5.038,49,3.703,5.104,60,3.062,0.042,36,0.015
5,6401492025FLE024,Female,2025-02-20,9.42,0.471,60,-0.283,2.839,58,3.293,4.580,49,3.366,4.991,60,2.995,0.124,36,0.045
6,6401492025FLE008,Female,2025-02-16,9.06,0.170,62,-0.105,2.722,61,3.321,3.656,53,2.907,4.552,63,2.868,0.168,44,0.074
7,6401492025FLE029,Female,2025-02-21,7.39,0.177,58,-0.103,2.128,56,2.383,3.645,49,2.679,4.043,59,2.385,0.116,41,0.048
8,6401492025FLE011,Female,2025-02-17,6.56,0.000,61,-0.000,2.190,59,2.584,2.235,52,1.743,3.523,61,2.149,0.178,45,0.080
9,6402382024NCS310,Male,2024-02-13,4.74,-0.231,80,0.185,1.231,78,1.920,1.002,68,1.022,1.942,80,1.554,0.104,55,0.057
10,6401492025FLE141,Male,2025-02-24,4.26,0.266,61,-0.162,1.265,59,1.493,2.129,47,1.501,2.479,58,1.438,-0.016,38,-0.006
11,6401492023FLE078,Female,2023-02-21,3.25,0.305,64,-0.195,1.611,62,1.998,0.643,52,0.502,1.592,61,0.971,-0.052,50,-0.026
12,6401492022FLE002,Female,2022-01-23,-1.61,-0.176,66,0.116,-0.016,64,-0.020,-1.363,55,-1.124,-0.917,66,-0.605,0.055,50,0.028
282 changes: 282 additions & 0 deletions reports/2026-02-07-rank-animals/report.md
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# Rank Animals Report — Weighted Trait Index

Closes #2

**Date**: February 7, 2026
**Action**: Rank Animals — Weighted Trait Index Ranking
**Breed**: Katahdin
**Animals Analyzed**: 12
**Database Last Updated**: November 21, 2025

---

## Summary

This report ranks 12 Katahdin sheep from Beyond Blessed Farm using a weighted trait index. Since no specific trait weights were provided, we used a balanced weighting scheme suitable for hair sheep:

- **BWT** (Birth Weight): -1.0 — Lower birth weight is preferred to reduce birthing difficulties
- **WWT** (Weaning Weight): 2.0 — Higher weaning weight indicates faster early growth
- **YWT** (Yearling Weight): 1.5 — Higher yearling weight for market lamb production
- **PWWT** (Post-Weaning Weight): 1.0 — Growth after weaning
- **NLB** (Number of Lambs Born): 1.0 — Fertility trait for maternal ability

**Score Formula**: `Score = Σ(trait_value × weight × accuracy / 100)`

The collection includes 10 females and 2 males. Most animals are young (born in 2025), with 6402382024NCS310 being a proven sire with 25 progeny and higher accuracy values.

---

## Rankings

| Rank | LPN ID | Gender | Score | Key Strengths |
|------|--------|--------|-------|---------------|
| 1 | 6401492025FLE087 | Female | 11.91 | High WWT, High YWT, High NLB |
| 2 | 6401492020FLE249 | Female | 10.92 | High WWT |
| 3 | 6401492025FLE082 | Female | 9.95 | High WWT, High YWT |
| 4 | 6401492025FLE047 | Female | 9.89 | High WWT, High YWT |
| 5 | 6401492025FLE024 | Female | 9.42 | High WWT, High YWT, High NLB |
| 6 | 6401492025FLE008 | Female | 9.06 | High WWT, High NLB |
| 7 | 6401492025FLE029 | Female | 7.39 | Balanced traits |
| 8 | 6401492025FLE011 | Female | 6.56 | High NLB |
| 9 | 6402382024NCS310 | Male | 4.74 | Low BWT |
| 10 | 6401492025FLE141 | Male | 4.26 | Balanced traits |
| 11 | 6401492023FLE078 | Female | 3.25 | Balanced traits |
| 12 | 6401492022FLE002 | Female | -1.61 | Low BWT |

---

## Detailed Animal Profiles

### 1. 6401492025FLE087

**Gender**: Female
**Date of Birth**: 3/2/2025
**Overall Score**: 11.91

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | +0.35 | 63% | -0.22 | Above average (worse) (43rd percentile) |
| WWT | +3.07 | 61% | +3.74 | Above average (66th percentile) |
| YWT | +5.73 | 53% | +4.55 | Top 25% (75th percentile) |
| PWWT | +5.90 | 64% | +3.77 | Top 25% (79th percentile) |
| NLB | +0.13 | 44% | +0.06 | Below average (47th percentile) |

**Analysis**: Strong weaning weight indicates good early growth. Excellent yearling weight for market production.

### 2. 6401492020FLE249

**Gender**: Female
**Date of Birth**: 2/5/2020
**Overall Score**: 10.92

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | +0.24 | 74% | -0.18 | Above average (worse) (48th percentile) |
| WWT | +3.04 | 71% | +4.32 | Above average (66th percentile) |
| YWT | +3.55 | 63% | +3.35 | Above average (65th percentile) |
| PWWT | +4.61 | 73% | +3.37 | Above average (71st percentile) |
| NLB | +0.12 | 57% | +0.07 | Below average (45th percentile) |

**Analysis**: Strong weaning weight indicates good early growth.

### 3. 6401492025FLE082

**Gender**: Female
**Date of Birth**: 2/28/2025
**Overall Score**: 9.95

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | +0.33 | 65% | -0.22 | Above average (worse) (44th percentile) |
| WWT | +2.69 | 63% | +3.39 | Above average (62nd percentile) |
| YWT | +4.38 | 55% | +3.62 | Above average (69th percentile) |
| PWWT | +4.78 | 65% | +3.11 | Above average (72nd percentile) |
| NLB | +0.11 | 45% | +0.05 | Below average (45th percentile) |

**Analysis**: Strong weaning weight indicates good early growth. Excellent yearling weight for market production.

### 4. 6401492025FLE047

**Gender**: Female
**Date of Birth**: 2/24/2025
**Overall Score**: 9.89

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | +0.43 | 59% | -0.25 | Above average (worse) (40th percentile) |
| WWT | +2.95 | 57% | +3.36 | Above average (65th percentile) |
| YWT | +5.04 | 49% | +3.70 | Above average (72nd percentile) |
| PWWT | +5.10 | 60% | +3.06 | Above average (74th percentile) |
| NLB | +0.04 | 36% | +0.02 | Below average (38th percentile) |

**Analysis**: Strong weaning weight indicates good early growth. Excellent yearling weight for market production.

### 5. 6401492025FLE024

**Gender**: Female
**Date of Birth**: 2/20/2025
**Overall Score**: 9.42

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | +0.47 | 60% | -0.28 | Above average (worse) (38th percentile) |
| WWT | +2.84 | 58% | +3.29 | Above average (64th percentile) |
| YWT | +4.58 | 49% | +3.37 | Above average (70th percentile) |
| PWWT | +4.99 | 60% | +2.99 | Above average (73rd percentile) |
| NLB | +0.12 | 36% | +0.04 | Below average (46th percentile) |

**Analysis**: Strong weaning weight indicates good early growth. Excellent yearling weight for market production.

### 6. 6401492025FLE008

**Gender**: Female
**Date of Birth**: 2/16/2025
**Overall Score**: 9.06

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | +0.17 | 62% | -0.11 | Below average (better) (52nd percentile) |
| WWT | +2.72 | 61% | +3.32 | Above average (63rd percentile) |
| YWT | +3.66 | 53% | +2.91 | Above average (65th percentile) |
| PWWT | +4.55 | 63% | +2.87 | Above average (71st percentile) |
| NLB | +0.17 | 44% | +0.07 | Above average (50th percentile) |

**Analysis**: Strong weaning weight indicates good early growth. Above-average fertility.

### 7. 6401492025FLE029

**Gender**: Female
**Date of Birth**: 2/21/2025
**Overall Score**: 7.39

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | +0.18 | 58% | -0.10 | Below average (better) (51st percentile) |
| WWT | +2.13 | 56% | +2.38 | Above average (56th percentile) |
| YWT | +3.65 | 49% | +2.68 | Above average (65th percentile) |
| PWWT | +4.04 | 59% | +2.39 | Above average (68th percentile) |
| NLB | +0.12 | 41% | +0.05 | Below average (45th percentile) |

**Analysis**: Balanced trait profile with moderate values across all traits.

### 8. 6401492025FLE011

**Gender**: Female
**Date of Birth**: 2/17/2025
**Overall Score**: 6.56

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | +0.00 | 61% | -0.00 | Below average (better) (59th percentile) |
| WWT | +2.19 | 59% | +2.58 | Above average (57th percentile) |
| YWT | +2.23 | 52% | +1.74 | Above average (58th percentile) |
| PWWT | +3.52 | 61% | +2.15 | Above average (64th percentile) |
| NLB | +0.18 | 45% | +0.08 | Above average (51st percentile) |

**Analysis**: Above-average fertility.

### 9. 6402382024NCS310

**Gender**: Male
**Date of Birth**: 2/13/2024
**Overall Score**: 4.74

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | -0.23 | 80% | +0.18 | Below average (better) (70th percentile) |
| WWT | +1.23 | 78% | +1.92 | Below average (46th percentile) |
| YWT | +1.00 | 68% | +1.02 | Above average (52nd percentile) |
| PWWT | +1.94 | 80% | +1.55 | Above average (55th percentile) |
| NLB | +0.10 | 55% | +0.06 | Below average (44th percentile) |

**Analysis**: Low birth weight reduces birthing difficulties.

### 10. 6401492025FLE141

**Gender**: Male
**Date of Birth**: 2/24/2025
**Overall Score**: 4.26

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | +0.27 | 61% | -0.16 | Above average (worse) (47th percentile) |
| WWT | +1.26 | 59% | +1.49 | Below average (47th percentile) |
| YWT | +2.13 | 47% | +1.50 | Above average (58th percentile) |
| PWWT | +2.48 | 58% | +1.44 | Above average (58th percentile) |
| NLB | -0.02 | 38% | -0.01 | Below average (33rd percentile) |

**Analysis**: Balanced trait profile with moderate values across all traits.

### 11. 6401492023FLE078

**Gender**: Female
**Date of Birth**: 2/21/2023
**Overall Score**: 3.25

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | +0.30 | 64% | -0.20 | Above average (worse) (45th percentile) |
| WWT | +1.61 | 62% | +2.00 | Above average (50th percentile) |
| YWT | +0.64 | 52% | +0.50 | Above average (50th percentile) |
| PWWT | +1.59 | 61% | +0.97 | Above average (53rd percentile) |
| NLB | -0.05 | 50% | -0.03 | Below average (29th percentile) |

**Analysis**: Balanced trait profile with moderate values across all traits.

### 12. 6401492022FLE002

**Gender**: Female
**Date of Birth**: 1/23/2022
**Overall Score**: -1.61

| Trait | Value | Accuracy | Contribution to Score | Breed Position |
|-------|-------|----------|----------------------|----------------|
| BWT | -0.18 | 66% | +0.12 | Below average (better) (67th percentile) |
| WWT | -0.02 | 64% | -0.02 | Below average (33rd percentile) |
| YWT | -1.36 | 55% | -1.12 | Below average (40th percentile) |
| PWWT | -0.92 | 66% | -0.61 | Below average (38th percentile) |
| NLB | +0.06 | 50% | +0.03 | Below average (40th percentile) |

**Analysis**: Low birth weight reduces birthing difficulties.

---

## Breed Context

**Katahdin Breed Ranges** (from NSIP database):

| Trait | Minimum | Maximum | Midpoint |
|-------|---------|---------|----------|
| BWT | -0.89 | 1.30 | 0.20 |
| WWT | -3.02 | 6.15 | 1.57 |
| YWT | -9.50 | 10.67 | 0.58 |
| PWWT | -7.10 | 9.38 | 1.14 |
| NLB | -0.36 | 0.69 | 0.16 |

---

## Recommendations

1. **Top-Ranked Females** (6401492025FLE087, 6401492020FLE249, 6401492025FLE082) show excellent growth traits and should be considered for retention as breeding stock.

2. **Proven Sire** (6402382024NCS310) has high-accuracy EBVs based on 25 progeny. Even though its composite index rank is mid-pack (#9), the combination of negative BWT and positive growth traits with 80% accuracy makes this ram a reliable, proven option for breeding.

3. **Young Stock** born in 2025 have lower accuracy values (36-65%) since they lack progeny data. Rankings may change as more performance data becomes available.

4. **Trait Trade-offs**: Animals with high growth (WWT, YWT, PWWT) tend to have higher birth weights. Balance selection pressure between growth and ease of lambing.

---

## Trait Glossary

- **BWT** (Birth Weight): Weight at birth in lbs. Lower values reduce birthing difficulties.
- **WWT** (Weaning Weight): Weight at weaning (~60 days) in lbs. Higher indicates faster early growth.
- **YWT** (Yearling Weight): Weight at ~12 months in lbs. Key for market lamb production.
- **PWWT** (Post-Weaning Weight): Growth after weaning in lbs.
- **NLB** (Number of Lambs Born): Fertility trait - more lambs per lambing.

**Accuracy** indicates reliability of the EBV:
- < 40%: Low reliability
- 40-60%: Moderate reliability
- 60-80%: High reliability
- > 80%: Very high reliability (extensive progeny testing)