BGPT: Create Graphs: FECRT method comparison & sensitivity

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Quick Analysis Plan Copied

A rigorous FECRT method-comparison and sensitivity graph plan should plot farm-level faecal egg count reduction with credible/confidence intervals against the 95% resistance threshold, and quantify method sensitivity via interval width and cross-method agreement (e.g., Cohen's k = 0.656 between eggCounts and bayescount classifications)

Long Analysis Plan

FECRT Method Comparison & Sensitivity — Graph Plan

Goal: visualize how FECRT point estimates, interval uncertainty, and analysis-method choice affect resistance classification. Two decisive figures below use only reported values.

Figure 1 — Farm-level FECR with 95% credible intervals vs the 95% susceptibility threshold. Data: six Lithuanian stables, fenbendazole FECRT (n = 10 treated/stable, Bayesian hierarchical model) . Overlap of each CI with the 95% line instantly exposes ambiguous classifications (farms 2, 3, 5, 6).

Figure 2 — Statistical sensitivity: CI width per farm. Interval width ranges from 1.1 pp (farm 1) to 48.8 pp (farm 6), showing why small per-stable samples (n ≈ 10) yield low discriminatory sensitivity. This is the core sensitivity graph: farms with wide intervals cannot distinguish resistance from susceptibility.

Method-comparison layer (planned, when multi-method data are loaded): a Bland–Altman-style or agreement panel comparing classifications from eggCounts vs bayescount (agreement 10/11, Cohen's k = 0.656, revised Kaplan 2023 guidelines) , plus FECRT vs in-vitro EHA/LDA concordance in Danish goats (BZ largely concordant; LEV/IVM discrepant) .

Design notes: one column; shared y-axis 0–105%; dashed reference at 95%; color by classification status; log-scale option for EC50 panels. Uncertainty: the Italian/Argentine study reports only CI bounds (lower 90% CI −22% to 83% in Argentina; 91.9–98.5% low-level resistance in Italy) , so its farms enter the comparison as CI-bound ranges rather than point estimates — a known incompleteness.

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Updated: October 03, 2026

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1. This paper reviews and updates WAAVP guidelines for detecting anthelmintic resistance in veterinary nematodes, introducing and detailing new in vitro tests (egg hatch test, microagar larval development test), molecular assays (benzimidazole resistance via beta-tubulin mutations with PCR/qPCR), and standardized interpretations including FECRT adaptations across sheep, goats, cattle, horses, and pigs, while calling for international SOP standardization and cross-lab validation. [2006]

8QualityResults Limitations Context Blindspots Methods Sample Conflict Data

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2. This study presents a novel method for estimating confidence limits in faecal egg count reduction tests (FECRT) for new anthelmintics, particularly when efficacy is high and nematode aggregation is significant, thereby addressing the challenges of anthelmintic resistance management in sheep. [2012]

8QualityResults Limitations Context Blindspots Methods Sample Conflict

↗ Paper Review ↗ Full Paper

3. Subcutaneous ivermectin (0.2 mg/kg) produced high FECR in most Italian beef herds but failed against resistant GIN populations on all Argentine farms, with Cooperia and Haemonchus as main resistant genera; plasma exposure was similar in cows and calves. [2026]

6QualityResults Limitations Context Blindspots Methods Sample Conflict Data

↗ Paper Review ↗ Full Paper

4. An in-depth scoping review finds widespread anthelmintic resistance among gastrointestinal nematodes in African livestock, highlights substantial methodological variation in FECRT studies, and calls for standardized surveillance and sustainable, non-chemical parasite-control strategies. [2025]

7QualityResults Limitations Context Blindspots Methods Sample Conflict

↗ Paper Review ↗ Full Paper

5. Field-based assessment of anthelmintic resistance in Scottish dairy cattle nematodes using FECRT, egg hatch testing, and mixed amplicon sequencing, revealing multi-drug resistance alleles, species composition shifts favoring resistant taxa, and highlighting the need for molecular diagnostics and consistent benchmarking across guidelines. [2025]

8QualityResults Limitations Context Blindspots Methods Sample Conflict Data

↗ Paper Review ↗ Full Paper

Key Insight

FECRT 'resistance' calls are often artifacts of interval width, not biology: in the Lithuanian data, three of six farms' 95% CrIs straddle the 95% threshold, so the same raw counts flip classification depending on the statistical method (Cohen's k = 0.656 between standard tools).

Keep Exploring

How does genus-specific FECRT partitioning by coproculture proportion propagate uncertainty compared with molecular nemabiome quantification?

What minimum per-group sample size yields a 95% credible interval narrower than 10 percentage points under overdispersed egg-count distributions?

Analysis Wizard

Building two Plotly figures from reported FECRT values: per-farm FECR with credible intervals against the 95% threshold, and CI-width sensitivity bars across stables.

Hypothesis Graveyard

'FECRT point estimate alone determines resistance status.' Falsified: credible-interval overlap with the threshold, not the mean, drives classification instability in the Lithuanian and Scottish datasets.

'In-vitro assays are interchangeable confirmations of FECRT.' Falsified in Danish goats: EHA/LDA concordance held for BZ but diverged for LEV and IVM.

Potential Experiments

Pooled reanalysis: fit both eggCounts and bayescount to raw EPG data from all cited studies with per-animal records, then regress classification discordance on sample size and true FECR to map the instability region.

Sequential FECRT extension: on borderlined farms (CrI straddling 95%), add a second treatment cohort at day 28 and test whether combined-interval classification reduces discordance vs single timepoint.

Science Art

Science Movie

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Discussion

BGPT Bias

I favor Bayesian interval-based interpretation of FECRT data, which may underweight practical field constraints that push practitioners toward simpler point-estimate cutoffs.

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Graphs Built From Reported Results

Turn exact figures reported in papers into graphs, each point traced to its source.Know what the science actually supports before you trust the answer.

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Long Analysis Plan

FECRT Method Comparison & Sensitivity — Graph Plan

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3. Subcutaneous ivermectin (0.2 mg/kg) produced high FECR in most Italian beef herds but failed against resistant GIN populations on all Argentine farms, with Cooperia and Haemonchus as main resistant genera; plasma exposure was similar in cows and calves. [2026]

4. An in-depth scoping review finds widespread anthelmintic resistance among gastrointestinal nematodes in African livestock, highlights substantial methodological variation in FECRT studies, and calls for standardized surveillance and sustainable, non-chemical parasite-control strategies. [2025]

7. Fenbendazole resistance among Cyathostominae in Lithuanian horse stables is widespread, with FBZ failing in several stables and showing variable FECRT results, underscoring the need for alternative parasite-control strategies. [2022]

8. This study evaluates the in vivo anthelmintic activity of young Areca catechu L. (areca nut) extract against Fasciola sp. eggs in goat feces, determining LC50 and fecal egg count reduction (FECRT) compared to a commercial dewormer. [2024]

9. This article provides a UK-based expert consensus on current best practice for equine de-worming, advocating targeted, diagnostic-driven parasite control and management strategies to slow resistance while reducing reliance on routine anthelmintic treatments. [2019]

10. Systematic review synthesizing in vitro and in vivo evidence on plant-derived anthelmintics against gastrointestinal nematodes in goats, highlighting prevalent plant families, active metabolites, efficacy differences between lab and animal studies, and key methodological gaps. [2019]

Ask a Follow-Up

Key Insight

FECRT 'resistance' calls are often artifacts of interval width, not biology: in the Lithuanian data, three of six farms' 95% CrIs straddle the 95% threshold, so the same raw counts flip classification depending on the statistical method (Cohen's k = 0.656 between standard tools).

Keep Exploring

How does genus-specific FECRT partitioning by coproculture proportion propagate uncertainty compared with molecular nemabiome quantification?

What minimum per-group sample size yields a 95% credible interval narrower than 10 percentage points under overdispersed egg-count distributions?

Analysis Wizard

Building two Plotly figures from reported FECRT values: per-farm FECR with credible intervals against the 95% threshold, and CI-width sensitivity bars across stables.

Hypothesis Graveyard

'FECRT point estimate alone determines resistance status.' Falsified: credible-interval overlap with the threshold, not the mean, drives classification instability in the Lithuanian and Scottish datasets.

'In-vitro assays are interchangeable confirmations of FECRT.' Falsified in Danish goats: EHA/LDA concordance held for BZ but diverged for LEV and IVM.

Potential Experiments

Pooled reanalysis: fit both eggCounts and bayescount to raw EPG data from all cited studies with per-animal records, then regress classification discordance on sample size and true FECR to map the instability region.

Sequential FECRT extension: on borderlined farms (CrI straddling 95%), add a second treatment cohort at day 28 and test whether combined-interval classification reduces discordance vs single timepoint.

Science Art

Science Movie

Make a narrated HD Science movie for this answer ($32 per minute)

Discussion

BGPT Bias

I favor Bayesian interval-based interpretation of FECRT data, which may underweight practical field constraints that push practitioners toward simpler point-estimate cutoffs.

Stay current without chasing every paper.

My BGPT

Trending

Graphs Built From Reported Results

Turn exact figures reported in papers into graphs, each point traced to its source.Know what the science actually supports before you trust the answer.

Explore by Goal

Quick Analysis Plan Copied

Long Analysis Plan

FECRT Method Comparison & Sensitivity — Graph Plan

Top Data Sources ExportMCP

3. Subcutaneous ivermectin (0.2 mg/kg) produced high FECR in most Italian beef herds but failed against resistant GIN populations on all Argentine farms, with Cooperia and Haemonchus as main resistant genera; plasma exposure was similar in cows and calves. [2026]

4. An in-depth scoping review finds widespread anthelmintic resistance among gastrointestinal nematodes in African livestock, highlights substantial methodological variation in FECRT studies, and calls for standardized surveillance and sustainable, non-chemical parasite-control strategies. [2025]

7. Fenbendazole resistance among Cyathostominae in Lithuanian horse stables is widespread, with FBZ failing in several stables and showing variable FECRT results, underscoring the need for alternative parasite-control strategies. [2022]

8. This study evaluates the in vivo anthelmintic activity of young Areca catechu L. (areca nut) extract against Fasciola sp. eggs in goat feces, determining LC50 and fecal egg count reduction (FECRT) compared to a commercial dewormer. [2024]

9. This article provides a UK-based expert consensus on current best practice for equine de-worming, advocating targeted, diagnostic-driven parasite control and management strategies to slow resistance while reducing reliance on routine anthelmintic treatments. [2019]

10. Systematic review synthesizing in vitro and in vivo evidence on plant-derived anthelmintics against gastrointestinal nematodes in goats, highlighting prevalent plant families, active metabolites, efficacy differences between lab and animal studies, and key methodological gaps. [2019]

Ask a Follow-Up

Key Insight

FECRT 'resistance' calls are often artifacts of interval width, not biology: in the Lithuanian data, three of six farms' 95% CrIs straddle the 95% threshold, so the same raw counts flip classification depending on the statistical method (Cohen's k = 0.656 between standard tools).

Keep Exploring

How does genus-specific FECRT partitioning by coproculture proportion propagate uncertainty compared with molecular nemabiome quantification?

What minimum per-group sample size yields a 95% credible interval narrower than 10 percentage points under overdispersed egg-count distributions?

Analysis Wizard

Building two Plotly figures from reported FECRT values: per-farm FECR with credible intervals against the 95% threshold, and CI-width sensitivity bars across stables.

Hypothesis Graveyard

'FECRT point estimate alone determines resistance status.' Falsified: credible-interval overlap with the threshold, not the mean, drives classification instability in the Lithuanian and Scottish datasets.

'In-vitro assays are interchangeable confirmations of FECRT.' Falsified in Danish goats: EHA/LDA concordance held for BZ but diverged for LEV and IVM.

Potential Experiments

Pooled reanalysis: fit both eggCounts and bayescount to raw EPG data from all cited studies with per-animal records, then regress classification discordance on sample size and true FECR to map the instability region.

Sequential FECRT extension: on borderlined farms (CrI straddling 95%), add a second treatment cohort at day 28 and test whether combined-interval classification reduces discordance vs single timepoint.

Science Art

Science Movie

Make a narrated HD Science movie for this answer ($32 per minute)

Discussion

BGPT Bias

I favor Bayesian interval-based interpretation of FECRT data, which may underweight practical field constraints that push practitioners toward simpler point-estimate cutoffs.

Stay current without chasing every paper.

My BGPT

Trending

Top Data Sources Export MCP