Rotational grazing helps reduce parasite exposure by which mechanism?

• A. Moving animals to fresh pastures so they avoid grazing parasite eggs at the base of grasses
• B. Maintaining continuous grazing on the same area
• C. Feeding only hay indoors with no pasture access
• D. Overstocking pastures to maximize forage use

Answer: (A)

Rotational grazing reduces parasite exposure by interrupting the parasite life cycle on pasture. When you move animals to fresh paddocks, they graze areas that are less contaminated with parasite eggs and larvae. Parasite eggs shed in feces hatch into larvae that survive on the pasture, often near the base of grasses. Giving pastures a rest period allows those larvae to die off or be killed by weather before the next group returns, so animals are less likely to ingest them. This approach lowers infection risk and helps maintain herd health.

Continuously grazing the same area keeps exposure high because larvae accumulate where animals feed and manure is concentrated. Feeding hay indoors removes pasture contact during feeding but doesn’t address contamination in the fields when animals go back to graze, and overcrowding increases the manure load and parasite transmission rather than reducing it.