# When the worms come marching in - Canadian Cattlemen

> An article on gastrointestinal parasites in cattle explains how worm burdens build on pasture through the summer and peak in fall. It notes that high parasite loads reduce body condition, growth and reproduction. It also warns that overuse of "mectin" dewormers is leading to resistance.

- Date: 2022-10-11 · published 2022-10-11T12:00:00.000Z
- Category: disease · region US · magnitude low
- Page: https://feedsoft.ai/events/39084-when-the-worms-come-marching-in-canadian-cattlemen
- Commodities: [Live Cattle](https://feedsoft.ai/c/LCATTLE.md), [Feeder Cattle](https://feedsoft.ai/c/FCATTLE.md)

## Why it matters

Parasite loads affect cattle performance and weight gain, which matter for feeder cattle supply. The effect on prices is minor and indirect.

## Similar past events

| Commodity | Date | Event | 5-day % | 20-day % |
| --- | --- | --- | --- | --- |
| LCATTLE | 2026-04-06 | [Why are cattle prices surging in the U.S. right now?](https://feedsoft.ai/events/10267-why-are-cattle-prices-surging-in-the-u-s-right-now.md) | +3.1% | +3.6% |
| LCATTLE | 2024-11-28 | [Screwworms impacting cattle trade](https://feedsoft.ai/events/27348-screwworms-impacting-cattle-trade.md) | +0.7% | +3.7% |
| LCATTLE | 2024-10-24 | [The flesh-eating worms devouring cows](https://feedsoft.ai/events/27811-the-flesh-eating-worms-devouring-cows.md) | +0.9% | -1.1% |
| LCATTLE | 2017-04-09 | [Biosecurity plan vital when moving cattle in NT​ \| Queensland Country Life \| QLD](https://feedsoft.ai/events/71457-biosecurity-plan-vital-when-moving-cattle-in-nt-queensland-country-life-qld.md) | +2.9% | +9.9% |
| LCATTLE | 2020-03-06 | [Analyst: Cattle markets roiled by the coronavirus](https://feedsoft.ai/events/5172-analyst-cattle-markets-roiled-by-the-coronavirus.md) | -4.7% | -5.8% |
| FCATTLE | 2026-04-06 | [Why are cattle prices surging in the U.S. right now?](https://feedsoft.ai/events/10267-why-are-cattle-prices-surging-in-the-u-s-right-now.md) | +0.3% | -0.4% |
| FCATTLE | 2024-11-28 | [Screwworms impacting cattle trade](https://feedsoft.ai/events/27348-screwworms-impacting-cattle-trade.md) | -1.5% | +1.0% |
| FCATTLE | 2024-07-18 | [Collaborative Efforts to Combat the Cattle Screwworm in Latin America - LatinAmerican Post](https://feedsoft.ai/events/29214-collaborative-efforts-to-combat-the-cattle-screwworm-in-latin-america.md) | -0.6% | -4.1% |

## Sources

- canadiancattlemen.ca: https://www.canadiancattlemen.ca/livestock/beef-cattle/when-the-worms-come-marching-in/

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