What clinical association prompted changes in the formulation of equine dewormers?

The correct answer is based on the growing recognition of the link between tapeworms and colic in horses. Research has demonstrated that certain types of tapeworms, particularly Anoplocephala perfoliata, can cause gastrointestinal disturbances that lead to colic, which is a common and potentially serious condition in equines. This association has prompted veterinarians and pharmaceutical companies to rethink their deworming strategies, leading to changes in formulation.

With the understanding that targeting tapeworms may be crucial for preventing colic, equine dewormers have been updated to specifically address this issue. Thus, formulations have been modified to ensure that they effectively treat tapeworms, in addition to other parasites, as part of a comprehensive parasite management program in horses. This shift in focus is critical for improving equine health outcomes, particularly in preventing conditions like colic that can result in significant morbidity.

The influence of parasite resistance on deworming practices, though important, is distinct from the immediate clinical impact of tapeworms on colic. Additionally, while increased efficacy of older drugs and reduced side effects in older horses are relevant considerations in the broader context of equine health and pharmacology, they do not specifically address the