FAMACHA©: Predictive value for control of Haemochus sp. in sheep from Brazilian Cerrado

• Autor(a) principal: Moreira, Roberta Tavares
• Data de Publicação: 2021
• Outros Autores: Mota, Ana Lourdes Arrais de Alencar, Câmara, Antonio Carlos Lopes, Soto-Blanco, Benito, Borges, José Renato Junqueira
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Semina. Ciências Agrárias (Online)
• Texto Completo: https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/42750
• topic: Haemonchus sp.; selective control; sensitivity; small ruminants; specificity.; Controle seletivo; Especificidade; Haemonchus; Pequenos ruminantes; Sensibilidade.

This study aimed to evaluate the sensitivity and specificity of FAMACHA© method, correlating with packed cell volume (PCV) and egg count (FEC), as well as to evaluate the clinical signs of Haemonchus sp. infection in sheep from Brazilian Cerrado. Over two years (2017 to 2019), 1,435 sheep were subjected to clinical and parasitological evaluations. Sheep from six breeds (Santa Inês, Dorper, White Dorper, Ile de France, Suffolk, and crossbreed) were subdivided into five production categories (pregnant, lactating, non-pregnant/lactating ewes, breeding males, and weaned lambs). Parasitological evaluations included FEC and coproculture. In the clinical evaluation, all sheep underwent determination of the FAMACHA© score and PCV. Haemonchus sp. larvae were predominant in coprocultures of the flocks (76.4%) and in each animal production category evaluated (69.4 to 84.3%). FAMACHA© method showed high sensitivity (70.6%) for evaluating sheep with scores bigger smaleer 3, and PCV smaller 23%, and high specificity (97.5%) in animals with higher scores (4 and 5), and PCV smaller 18%. A negative correlation was observed between FAMACHA© scores and PCV (-0.46) and between PCV and FEC (-0.47), while a positive correlation was observed between FAMACHA© scores and FEC (0.22) (p bigger smaleer 0.01). The vast majority of the animals evaluated (54.5%) were clinically resistant to gastrointestinal parasites. Due to the high sensitivity and specificity, we concluded that the method could be a valuable diagnostic alternative and an auxiliary tool in the implementation of selective treatment for helminthic infection in sheep from Brazilian Cerrado.