PATHOLOGY

Detailed explanation-1: -Nasal myiasis is a chronic rhinitis and sinusitis caused by the larval forms of the botfly, Oestrus ovis . The botfly deposits eggs around the nostrils of sheep. The ova hatch and the larvae migrate throughout the nasal cavity and sinuses, feeding on mucus and debris.

Detailed explanation-2: -Common important internal parasites of cattle are hair-worms, lung worms, liver flukes and coccidia. Common external parasites include horn flies, lice and grubs.

Detailed explanation-3: -Ticks. Ticks are small arachnids that feed on the blood of mammals and are known to spread diseases among humans and animals.