Breed · Cattle

Aberdeen Angus: adverse event reports

FDA breed label "Aberdeen Angus" · single-breed animals only

Read this first · FDA's caveat, in its words

An API dataset query result cannot be used to estimate the risk associated with the product or compare one drug or device product with another. When looking at the results, be aware that there is no certainty that the reported drug or device caused the adverse event. This dataset should not be the sole source of information for clinical decision-making or other assumptions about the safety or effectiveness of a product. The adverse event may have been related to an underlying disease, other drugs used at the same time or other non-drug related sources. FDA Center for Veterinary Medicine

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Not veterinary advice. This site lists what was reported to FDA. For an animal that is unwell, contact a veterinarian.

2,473reports, 1987–20267.9% of cattle reports

50reports, 12 months to March 202650 in the 12 months before

62.3%classed serious, as reportedall cattle: 58.4%

20.5%name doramectinall cattle: 10.3%

2,473 adverse event reports received by FDA describe an animal recorded as Aberdeen Angus (FDA breed label "Aberdeen Angus"). That is 7.9% of all reports about cattle. Crossbred animals are not counted here, only reports that give this single breed.

50 reports arrived in the 12 months to March 2026, close to the 50 of the 12 months before. A breed's count mostly mirrors how common the breed is; registration and ownership figures by breed are not public data, so no per-animal rate can be given.

By active ingredient, the drugs named most often are doramectin, ivermectin and eprinomectin. Doramectin is named in 20.5% of this breed's reports, a larger share than in reports about all cattle (10.3%).

The terms listed most often are death (26.2%), lack of efficacy (ectoparasite) - lice (17.8%) and lack of efficacy - NOS (9.3%). Death appears in 26.2% of reports, about the same share as in all cattle reports (29.4%). 62.3% of reports stating seriousness were classed as serious, against 58.4% for cattle overall.

Drugs named most often, by active ingredient

Active ingredients recorded for the drug	Reports	Share of Aberdeen Angus reports	Share of all cattle reports
Doramectin	507	20.5%	10.3%
Ivermectin	301	12.2%	6.9%
Eprinomectin	202	8.2%	4.8%
Moxidectin	164	6.6%	4.2%
Tulathromycin	151	6.1%	7.3%
Monensin	138	5.6%	10.8%
Progesterone	138	5.6%	1.5%
Dinoprost Tromethamine	112	4.5%	2.9%
Oxytetracycline	89	3.6%	2.1%
Tilmicosin Phosphate	60	2.4%	2.6%
Florfenicol	40	1.6%	1.6%
Tildipirosin	38	1.5%	1.3%
Ceftiofur Crystalline Free Acid	35	1.4%	3.1%
Clorsulon + Ivermectin	32	1.3%	1%
Florfenicol + Flunixin	26	1.1%	0.9%
Gamithromycin	26	1.1%	1.1%
Melengestrol Acetate	25	1%	2.4%
Albendazole	23	0.9%	0.9%
Flunixin Meglumine	23	0.9%	0.9%
Enrofloxacin	21	0.8%	0.7%

Ordered by report count. Differences from the species column often come from body size (which drugs a breed is prescribed) and from how common the breed was in the years a drug sold most. FDA states that these data cannot be used to estimate risk or to compare one product with another. Brand and manufacturer names are masked by FDA in these records.

Signs listed in reports

share of Aberdeen Angus reports listing the termall cattle reports

Death26.2%648
Lack of efficacy (ectoparasite) - lice[the product did not have the expected effect: lice]17.8%439
Lack of efficacy - NOS[the product did not have the expected effect]9.3%231
Pruritus[itching]7.8%194
Lack of efficacy (bacteria) - NOS[the product did not have the expected effect: target not specified]7.4%184
Ineffective, estrus synchroniz[legacy FDA term: the product did not have the expected effect (estrus synchroniz)]5.9%146
Alopecia NOS[hair loss, type not specified]5.6%139
Anaphylaxis[sudden severe allergic-type reaction]4.9%120
Ineffective, lice biting[legacy FDA term: the product did not have the expected effect (lice biting)]4.9%120
Systemic disorder NOS[NOS: not otherwise specified]3.7%91
Hair loss NOS[NOS: not otherwise specified]3.3%82
Recumbency[lying down and unable or unwilling to rise]3.3%81
Injection site swelling[swelling where the injection was given]3.2%80
Depression[dull, quiet or withdrawn]2.6%64
Anorexia[not eating]2.5%63
Collapse2.3%58
Ineffective, parasite(s) NOS[legacy FDA term: the product did not have the expected effect (parasite(s) nos)]2.3%57
Dyspnoea[difficulty breathing]2.3%56
Death-treatment failure2.1%53
PR-lung(s), lesion(s)[legacy FDA term: lesions found in the lungs]2%49
Hypersalivation[drooling]1.9%48
Scratching1.9%48
Lack of efficacy (ectoparasite) - NOS[the product did not have the expected effect: target not specified]1.9%47
Diarrhoea[diarrhea]1.8%44
Rubbing1.7%41

Age and weight

Age of the animal

Under 1 year26.3%651

1 to 3 years21.8%540

4 to 7 years4%99

8 to 11 years0.8%21

12 years and over0.2%4

Age not given46.8%1,158

Weight of the animal

Under 5 kg (11 lb)0%1

5 to 9.9 kg (11–22 lb)0%0

10 to 24.9 kg (22–55 lb)0.1%3

25 to 44.9 kg (55–99 lb)0.8%19

45 kg and over (99 lb+)61%1,509

Weight not given38.1%941

Coloured bar: Aberdeen Angus reports. Grey bar: all cattle reports.

Trend and outcomes

Reports by month FDA received them. The newest months are incomplete because FDA posts reports with a delay of three to six months.

Outcome recorded in the report

Recovered/Normal6.8%168

Recovered with Sequela1.1%26

Ongoing5.9%146

Died31.8%786

Euthanized0.9%23

Outcome Unknown22.6%560

Beside all cattle

Measure	Aberdeen Angus	All cattle
Reports	2,473	31,229
Latest 12 months	50	644
Classed serious, of reports stating it	62.3%	58.4%
Death or euthanasia recorded, per 1,000 reports	324.7	368

Questions about Aberdeen Angus reports

How many FDA adverse event reports involve Aberdeen Angus?

2,473 reports through March 2026, 7.9% of reports about cattle; 50 in the latest 12 months.

Which drugs are named most often in Aberdeen Angus reports?

By active ingredient: doramectin (507), ivermectin (301), eprinomectin (202), moxidectin (164) and tulathromycin (151). Brands are masked in the public data.

What signs are reported most for this breed?

death (26.2%), lack of efficacy (ectoparasite) - lice (17.8%), lack of efficacy - NOS (9.3%), pruritus (7.8%) and lack of efficacy (bacteria) - NOS (7.4%).

Is the Aberdeen Angus more sensitive to certain drugs?

Report counts cannot answer that. They show what was reported, not what a drug did, and they are not adjusted for how many Aberdeen Angus animals exist or were treated. Breed-related drug sensitivities that are established are described on FDA-approved labels; a veterinarian is the person to ask about an individual animal.

Why are crossbreds not included?

FDA records crossbred animals with one or more component breeds. Counting them under each component would double count, so breed pages use single-breed reports only. Crossbreds remain in the species totals.

How do I report a problem?

Call the drug company using the number on the label, or send Form FDA 1932a to FDA. See the guide on how to report.

Where this comes from. Counts are built from the openFDA Animal & Veterinary adverse event bulk files released 28 Sep 2026, which hold reports FDA's Center for Veterinary Medicine received through 31 Mar 2026. openFDA masks brand and manufacturer names in these files, so drugs are counted by the active ingredients each record discloses and no figure is attributed to a brand, application or company. Ingredient names, and the separate reference lists of approved products, follow the FDA Green Book as of 1 Oct 2026. Breed names are FDA's labels rearranged into everyday order ("Aberdeen Angus" becomes "Aberdeen Angus"). No report text, lot numbers or reporter details are published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.