Parasite Reduction and Rest Periods in Intensive Rotational Grazing Schedules

The Parasite Lifecycle in Grazed Pastures

Parasites will start being a concern at about 12 days after the dung has been dropped. This is one reason intensive management matters. When cattle stay around the same dung for longer periods, exposure goes up along with fly numbers.

There's a fairly significant opportunity cost when cattle aren’t managed intensively. In casual grazing schedules animals are more exposed to parasites and flies. This lowers animal carrying capacity and creates avoidable health issues on the operation.

Why Move Cattle Daily

By moving our animals intensively we move them away from the dung, resulting in less parasite exposure and fewer flies. Most who embrace regenerative intensive grazing will move them once a day, sometimes even more often.

It depends on each context and is not always an exact science. Daily moves help interrupt the 12-day parasite lifecycle before it becomes a larger problem for the herd.

Choosing Rest Periods by Climate

How often a given pasture is grazed is likewise dependent upon context. For both the growth cycle and to avoid parasites, the minimum rest would be about 30 days in areas where there’s abundant rain. In an area where it’s more arid, a 90 day rest would be in order.

Watching the grass in given pastures with a goal to graze them before they go to seed remains part of the equation as well. Every situation is different, so these numbers serve as practical starting points rather than rigid rules.

Casual Grazing Increases Risks and Lowers Capacity

When we use a more casual grazing schedule the effects are negative. Animals are more exposed to parasites and flies. Animal carrying capacity decreases.

Intensive rotational grazing reverses those outcomes. It increases animal carrying capacity while keeping parasite exposure lower through timely moves and sufficient rest periods tailored to your climate.

Accepting Forage Left Behind

One aspect of this that is hard for many to embrace is when they move their cattle to the next pasture and there’s so much forage still available. It rankles because they feel like they’re wasting an opportunity and resource.

It’s only after grasping the benefits for parasite reduction, carrying capacity, and overall land function that it becomes easier to follow these schedules. On our operation we have found that consistent daily moves and 30- to 90-day rests pay off in healthier cattle and more productive pastures over time.