• Grazing System Definition: Mob grazing (also referred to as ultra-high-density grazing, UHDG) involves concentrating a very large herd or flock of animals at high stocking densities on a small pasture area for very short intervals (often hours to 1–2 days).
• Parasite Management Impact: Because animals are moved rapidly and paddocks undergo prolonged rest periods ($60\text{--}120$ days) exceeding the natural survival threshold of infective larvae ($L_3$ of Haemonchus or Ostertagia), mob grazing drastically reduces trichostrongylid parasite reinfection.
• Contrasting Grazing Strategies:
• Creep grazing: Allowing young suckling animals access to high-quality pasture via special creeps that exclude adult dams.
• Deferred grazing: Postponing grazing on designated pasture until after forage maturity or seed dispersal.

Correct option: (2) Mob grazing