关键词: 玉溪市, 羊, 肠道寄生虫, 感染率, 风险因素分析

Abstract: [Objective] This study was conducted to investigate the status of intestinal parasitic infection in sheep in Yuxi City, Yunnan Province, to analyze the infection risk factors, and to provide references for the scientific prevention and control of sheep intestinal parasitic diseases in this region. [Method] A total of 1 339 fresh fecal samples of 4 sheep breeds were collected from 88 farms （households） in 9 counties （districts） of Yuxi City. Parasite eggs were screened by saturated saline floating method and subsequently identified by morphological method. The differences in intestinal parasitic infection rates in sheep in different counties （districts） and of varied breeds were compared. The relevance between intestinal parasitic infection and age, gender of sheep, as well as altitude, temperature differences of the sampling regions were analyzed by epidemiological method. [Result] The overall infection rate of parasite eggs/oocysts in the collected fresh sheep fecal samples was 93.43% （1 251/1 339）. The positive rates of nematode eggs, Eimeria oocysts and mixed infection of nematode eggs/Eimeria oocysts were 24.42% （327/1 339）, 69.01% （924/1 339） and 20.09% （269/1 339）, respectively. No trematode eggs were detected. The positive rates of nematode eggs, Eimeria oocysts and mixed infection of nematode eggs/Eimeria oocysts among sheep in different counties （districts） and of varied breeds had differences. Risk factor analysis revealed that age of sheep as well as altitude and temperature of the sampling regions had moderate relevance with the single or mixed intestinal infections of nematode eggs and Eimeria oocysts, while gender of sheep had no relevance. [Conclusion] A high prevalence of intestinal parasitic infection was observed in sheep in Yuxi City, Yunnan Province, with the dominant infected species being nematodes and Eimeria. The intestinal parasitic infection rates varied by counties （districts） and sheep breeds. The age of sheep as well as the differences in altitude and temperature were the risk factors for the high prevalence.

Key words: Yuxi City, sheep, intestinal parasite, infection rate, risk factor analysis