# Herd sizes, trade risk pig health | American Veterinary Medical Association

> Iowa State veterinarian Jeffrey Zimmerman said about 1 million pigs move across state lines each week to other farms, and that outbreak responses must start within hours. He added that growing herd sizes reduce herd immunity, making herds more vulnerable to disease.

- Date: 2017-04-12 · published 2017-04-12T12:00:00.000Z
- Category: disease · region US · magnitude low
- Page: https://feedsoft.ai/events/71370-herd-sizes-trade-risk-pig-health-american-veterinary-medical-association
- Commodities: [Lean Hogs](https://feedsoft.ai/c/HOGS.md)

## Why it matters

Heavy pig movement and larger herds raise the risk of rapid disease spread, which could cut hog supply and shift demand for meal and feed ingredients if an outbreak occurs.

## Read by commodity

- HOGS: neutral

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| HOGS | 2025-05-27 | [One Health Approach: Pork Industry Prepares for H5N1 – American Association of Swine Veterinarians](https://feedsoft.ai/events/16002-one-health-approach-pork-industry-prepares-for-h5n1-american-association-of.md) | +2.6% | +15.1% |
| HOGS | 2021-07-21 | [Foreign Animal Disease – Page 29 – American Association of Swine Veterinarians](https://feedsoft.ai/events/45947-foreign-animal-disease-page-29-american-association-of-swine-veterinarians.md) | +1.5% | -8.8% |
| HOGS | 2018-04-04 | [SHIC’s Global Swine Disease Monitoring Report Addresses FMD – American Association of Swine Veterinarians](https://feedsoft.ai/events/65385-shic-s-global-swine-disease-monitoring-report-addresses-fmd-american.md) | -0.3% | +19.3% |
| HOGS | 2022-12-14 | [Strep Zoo Outbreak Demonstrates Value of African Swine Fever Rule-Out Testing – American Association of Swine Veterinarians](https://feedsoft.ai/events/16224-strep-zoo-outbreak-demonstrates-value-of-african-swine-fever-rule-out-testing.md) | +1.3% | -4.8% |
| HOGS | 2021-05-12 | [ASF, grain price volatility add risk to pig production \| Feed Strategy](https://feedsoft.ai/events/47095-asf-grain-price-volatility-add-risk-to-pig-production-feed-strategy.md) | -0.5% | +7.6% |

## Sources

- avma.org: https://www.avma.org/javma-news/2017-05-01/herd-sizes-trade-risk-pig-health

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Data from Feedsoft AI (https://feedsoft.ai/). For information only; not investment advice.