What seasonal factor can influence the susceptibility of sheep to worms?

Spring rain is a significant seasonal factor that influences the susceptibility of sheep to worms because it creates optimal conditions for the development and survival of parasitic larvae in the environment. During spring, increased moisture from rain enhances the growth of grass and other forage, providing a lush environment where sheep can graze. This lush vegetation also supports the life cycle of parasites, as the wet conditions allow for the proliferation of nematode larvae, particularly in the herbage where sheep graze.

As sheep graze on these pastures, they are more likely to ingest the larvae, leading to infections and increased worm burden. Therefore, spring rain is critical in determining the level of parasite exposure sheep encounter, making it a key seasonal factor in their susceptibility to worms. Understanding this dynamic is essential for sheep management practices aimed at minimizing the impact of parasites on flock health.