Seasonal dynamics of Anocentor nitens on horses in Brazil.

The research article examines the seasonal trends of Anocentor nitens, a common tick found on horses in Brazil. The study also explores effective treatment methods to control tick infestations.

Objectives and Methods

• This research sought to study the seasonal dynamics of Anocentor nitens, a tick widespread on horses in Brazil.
• The study conducted regular census of engorging females of this tick species on free-ranging horses from July 1995 to July 1997, in Pedro Leopoldo, Minas Gerais.
• Twenty horses were part of the experiment, divided into four groups with a balanced mix of horses with varying resistance levels based on initial infestation.
• One group, in sequence, was treated with an acaricide to prevent severe infestations every two weeks. The ticks’ census was conducted 38 days after each treatment.

Findings

• The acaricide treatments did not significantly affect the seasonal movements of the tick population.
• Three significant activity peaks were observed over a 12-month period. Two peaks were registered in the hot, wet season, and the last one in the cold, dry season.
• The population of ticks was relatively stable for the two 12-month periods, with a decline from spring and summer to autumn and winter.
• Infestation rates differed among the horses. Twenty percent of the horses accounted for nearly half of the total parasite load, while 30% comprised only 2.5%.
• The primary sites where the ticks were found were the ears (61%), mane (21%), and the muzzle and face (6%).

Recommendations

• The research paper concludes by discussing strategic control measures for handling A. nitens ticks infestations.