›› 2017, Vol. 44 ›› Issue (2): 561-567.doi: 10.16431/j.cnki.1671-7236.2017.02.036

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Study on Infection of 4 Kinds of Internal Parasites in Yaks in Hongyuan and Litang County of Northwest Sichuan Province

JI Hui-shu1,2, LUO Guang-rong3, XIAO Min3, ZEWANG Ren-zhen3, ZHU Qing2, CHEN He-qiang2, ZHANG Jun-jie2, GUO Zheng-hong1, YUE Lei1, ZHOU Jun1, WEN Juan1, YANG Qi-yue1, YANG Xiao-nong1   

  1. 1. College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610041, China;
    2. Center for Animal Epidemic Disease Control and Prevention in Ganzi Tibetan Autonomous Prefecture, Kangding 626000, China;
    3. Longri Breeding Farm of Sichuan Province, Aba 624400, China
  • Received:2016-07-18 Online:2017-02-20 Published:2017-02-25

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Abstract:

To understand the infection of main internal parasites in yaks, total of 402 fecal samples of yaks were collected from Hongyuan county in Aba prefecture and Litang county in Ganzi prefecture, the morphological characteristics of 4 kinds of internal parasitic eggs or oocysts were observed and the numbers of them were counted using the modified Liao's counting method. The results showed that in yaks of Hongyuan county, the average infection intensities of EPG or OPG of nematodes, cestodes, trematodes and coccidian were 11.59, 23.77, 42.45 and 14.72, respectively, and the total number of infections was 92.53 (48.91 to 154.90); The average infection rates of eggs or oocysts of these 4 kinds of parasites were 18.01%, 36.62%, 44.68% and 17.37%, respectively, and the total infection rate was 76.39%, which proved that trematodes was the dominant parasitic species and cestodes was also an important one in this area. In yaks of Litang county, the average infection intensities of EPG or OPG of nematodes, cestodes, trematodes and coccidian were 52.38, 13.10, 20.24 and 1.19, respectively, and the total number of infections was 86.90, the average infection rates of eggs or oocysts of these 4 kinds of parasites were 52.38%,19.05%,23.81% and 2.38%, respectively, the total infection rate was 78.57%, which proved that nematodes was the dominant parasitic species in this area. The infection patterns of internal parasitic eggs or oocysts in yaks in Hongyuan and Litang county were all mainly the single and double infection, the sums of these two patterns were 69.31% and 78.57%, respectively, which accounted for 90.73% and 100% of the total infection rate, respectively. The results in this paper showed that the parasitic disease in yaks was still an important disease harmful to yak production and herdsman health, meanwhile these results enriched the epidemiological data of the internal parasitic disease of yaks in Northwest plateau of Sichuan province and provided a theory basis for prevention and control of parasitic diseases in yaks in this area.

Key words: yak; internal parasite; infection

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