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Breed profile · FDA CVM July 2026 extract

Chicken (unknown) adverse-event record

Adverse-event filings for Chicken (unknown) (Chicken) in the FDA Center for Veterinary Medicine openFDA extract. Browse chicken breeds, reactions, and outcomes below.

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#151 of 510
by report volume (all breeds)
433
FDA CVM reports on file
58.4%
death-coded share of reports
#5 of 275
by death-coded share (≥50 reports)

How the 433 reports break down

By recorded gender -- every report on file for Chicken (unknown), no filtering.

Annual report volume

Annual adverse-event report trend Yearly FDA CVM adverse-event report counts for this breed. 22 16.5 11 5.5 0 2019 2020 2021 2022 2023 2024 2025 2026 Reports filed Death-coded reports
Annual report volume for Chicken (unknown) drawn from FDA CVM filings.

Data updated September 2026

The verdict

According to the FDA Center for Veterinary Medicine openFDA adverse-event extract, Chicken (unknown) ranks #151 of 510 by total reports (433) and #5 of 275 by death-coded share (58.4%). National dual: Retriever - Labrador is #1 of 510 by total adverse-event reports (93,675) at death-coded-share rank 195 of 275 breeds with at least 50 reports (3.7%); separately, Atlantic Salmon (Salmo salar) is #1 highest death-coded share at 99.0% (report rank #233).

93,675
Retriever - Labrador reports (#1)
99.0%
Atlantic Salmon (Salmo salar) death share (#1)
#151
This breed, reports of 510
#5
This breed, death share of 275

Report volume reflects how common a breed or drug is and how often owners and vets file — not actual risk. Death-coded share ranks are limited to entries with enough reports to be meaningful. The two maps do not agree at #1.

Release-over-release change

What changed in the latest FDA data snapshot

PlainBreed reconstructed the prior snapshot from dated openFDA partitions through 2025 Q4, then compared it with the 2026-07-27 openFDA export. Chicken (unknown) has 433 reports now versus 426 in that prior snapshot: 7 more (1.6%).

Report change
+7
Death-coded reports
+6
Death-coded share
+0.4 pts

This compares reported-event counts in two source snapshots. It does not establish a change in real-world risk, product safety, or disease incidence.

Subscribe to Chicken (unknown) changes

Total Reports

433

Above-median volume

Deaths Reported

253

of 433 reports

Death-coded share of reports

58.4%

Highest death-coded share

Avg Age at Report

0.2 yr

1.6 kg avg weight

Breed Safety Scorecard

F (25/100)

A weighted composite across 4 of 4 dimensions, each benchmarked against every tracked breed with at least 200 reports (n=185). Dimensions with insufficient data drop out and their weight redistributes to the rest, so a missing input never silently deflates the score.

Death rate F
58.4%

Share of reports coded as a fatality

Euthanasia rate F
2.5%

Share of reports resulting in euthanasia

Full recovery rate F
5.8%

Share of reports coded "Recovered/Normal"

5-year trend A
-27%

Change in annual report volume over the last 5 complete years

Death-Coded Outcome Share

Chicken (unknown) death-coded reports 58.4%
Cross-breed median

58.4% of 433 chicken (unknown) reports involved a death outcome.

How to read this number

Read alongside breed popularity, veterinary access, and owner awareness, these shape how many events ever reach the FDA. The comparison line marks the cross-breed median death-coded share (4.8%) among breeds with 50 or more reports; values above it suggest higher reporting bias toward severe outcomes, not necessarily higher true mortality.

Where Chicken (unknown)'s death-coded share sits among indexed breeds

Death-coded share of FDA CVM reports, breeds with ≥50 reports (July 2026 extract)

58% 98th percentile Higher share than 98% of 275 indexed breeds

5%–10%: 1 indexed breeds (0%). Below this entry. 20%–25%: 2 indexed breeds (1%). Below this entry. 25%–30%: 3 indexed breeds (1%). Below this entry. 30%–35%: 4 indexed breeds (1%). Below this entry. 35%–40%: 5 indexed breeds (2%). Below this entry. 40%–45%: 6 indexed breeds (2%). Below this entry. 45%–50%: 3 indexed breeds (1%). Below this entry. 50%–55%: 7 indexed breeds (3%). Below this entry. 55%–60%: 7 indexed breeds (3%). This entry sits in this band. 60%–65%: 21 indexed breeds (8%). Above this entry. 65%–70%: 11 indexed breeds (4%). Above this entry. 70%–75%: 15 indexed breeds (5%). Above this entry. 75%–80%: 13 indexed breeds (5%). Above this entry. 80%–85%: 11 indexed breeds (4%). Above this entry. 85%–90%: 12 indexed breeds (4%). Above this entry. 90%–95%: 12 indexed breeds (4%). Above this entry. 95%–100%: 142 indexed breeds (52%). Above this entry. Chicken (unknown) 5% 100% every breed with ≥50 FDA reports, bucketed by value

Each bar is a band; taller bars hold more indexed breeds. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source FDA Center for Veterinary Medicine, openFDA adverse event extract (PlainBreed) · July 2026 extract

This histogram uses the same ≥50-report cohort as the highest death-coded share ranking. A higher share means more of this breed's reported events were death-coded, not a mortality rate for living animals.

Average weight at time of report: 1.6 kg (3.5 lbs)

Top Reported Reactions

Death 174
Lack of efficacy (protozoa) - Coccidia 102
Increased mortality rate 76
Lack of efficacy - NOS 69
Loss of egg quantity 32
Accidental exposure 23
Enteritis 21
Lack of efficacy (bacteria) - NOS 20

Most Referenced Drugs

Narasin + Nicarbazin 128
Narasin 81
Monensin Sodium 69
Avilamycin 31
Tylosin 28
Narasin, Nicarbazin 27
Hygromycin B 20
Tylosin Tartrate 15

Outcome Breakdown

Died
248 (54.3%)
Outcome Unknown
158 (34.6%)
Recovered/Normal
25 (5.5%)
Euthanized
11 (2.4%)
Ongoing
8 (1.8%)
Recovered with Sequela
7 (1.5%)

Gender Distribution

Unknown 162 (37.4%)
Mixed 153 (35.3%)
Female 87 (20.1%)
Male 31 (7.2%)

Reports by Year

Year Reports Trend
2010 42
2011 47
2012 40
2013 42
2014 31
2015 37
2016 44
2017 29
2018 27
2019 14
2020 8
2021 11
2022 22
2023 9
2024 16
2025 8
2026 6

Chicken (unknown): high death-coded share in the FDA CVM extract

Signature read: Chicken (unknown)'s 58.4% death-coded share is in the upper third of the ≥50-report cohort (median 4.8%). According to FDA CVM filings indexed on PlainBreed as of July 2026 extract, Chicken (unknown) sits at #151 of 510 by report volume among all breeds and #1 of 4 among chicken breeds, with 433 reports and 253 (58.4%) death-coded. On death-coded share among breeds with ≥50 reports, it ranks #5 of 275. Mean age at report: 0.2 years, average weight 1.6 kg (3.5 lbs).

Top reported signs: Death (174), Lack of efficacy (protozoa) - Coccidia (102), Increased mortality rate (76). Most-referenced drug: Narasin + Nicarbazin (128 reports), followed by Narasin (81) and Monensin Sodium (69).

Outcome coding on 457 status-recorded reports is dominated by Died (54.3%). Annual submissions ranged 6-2,026 across 17 years on file.

Chicken Breeds With a Similar Report Volume

Chicken (other)
136 reports · 67.6% death-coded
Chicken (unspecified)
18 reports · 72.2% death-coded
Cornish Cobb
10 reports · 60.0% death-coded

Nationwide breeds with similar profiles

High-volume peer sets for Chicken (unknown) drawn from openFDA outside the Chicken family so the neighborhoods are not species containment (the similar-volume list above stays within species).

Similar death-coded share

Nearest other-species breeds with ≥50 reports (58.4% death-coded here).

Boer 61.3% · Goat Pig (other) 52.9% · Pig Pig (unknown) 51.8% · Pig Sheep (unknown) 51.0% · Sheep

What to do with this chicken

A report does not prove a drug caused the reaction, and popular breeds simply generate more reports.

Frequently Asked Questions

How many FDA adverse event reports involve Chicken (unknown)? ▼
There are 433 adverse event reports involving Chicken (unknown) in the FDA database, of which 253 were death-coded (58.4% of those reports). That is a share of REPORTED events, not a mortality rate for the breed: adverse events reach the FDA when something goes wrong, so the denominator is reports, never the population of animals. According to the same FDA CVM extract, Chicken (unknown) ranks #151 of 510 by report volume among all breeds PlainBreed indexes (#1 of 4 among chicken breeds).
Where does Chicken (unknown) sit among other breeds in PlainBreed's corpus? ▼
According to FDA CVM report volume, Chicken (unknown) is #151 of 510 breeds indexed on PlainBreed (same ordering as the most-reported-breeds ranking). Inside Chicken, it is #1 of 4. Among breeds with at least 50 reports, its death-coded share ranks #5 of 275 (same cohort as highest-death-rate). These are placement ranks in the reporting corpus, not clinical risk scores.
What are the most common adverse reactions reported for Chicken (unknown)? ▼
The most commonly reported adverse reactions for Chicken (unknown) are Death (174 reports), Lack of efficacy (protozoa) - Coccidia (102 reports), Increased mortality rate (76 reports), Lack of efficacy - NOS (69 reports), Loss of egg quantity (32 reports).
What drugs are most frequently associated with Chicken (unknown) adverse events? ▼
The drugs most frequently referenced in Chicken (unknown) adverse event reports are Narasin + Nicarbazin (128 reports), Narasin (81 reports), Monensin Sodium (69 reports), Avilamycin (31 reports), Tylosin (28 reports).
What is the average age of Chicken (unknown) in adverse event reports? ▼
The average age of Chicken (unknown) at the time of adverse event reports is 0.2 years, with an average weight of 1.6 kg (3.5 lbs).

Compare a breed's report volume against how common the breed is before drawing conclusions. See our methodology for how the death-coded share and rankings are computed, or read breed-specific reporting patterns and FDA CVM reporting.

Source: FDA Center for Veterinary Medicine openFDA Animal & Veterinary Adverse Events (CVM AER) · 2025

openFDA Animal & Veterinary Adverse Events (FDA CVM) for Chicken (unknown) (Chicken), extract as of July 2026 extract. 433 reports · 253 death-coded (58.4% of reports, not a mortality rate) · #151 of 510 by volume.

Informational only. FDA adverse-event reports are voluntary and do not prove causation; consult a veterinarian before acting on them. Verify with FDA CVM →