Seasonal dynamics of gastrointestinal helminths in naturally infected horses in Brazil

IF 2 2区农林科学 Q2 PARASITOLOGY

Veterinary parasitology Pub Date : 2024-11-28 DOI:10.1016/j.vetpar.2024.110358

Ricardo Velludo Gomes de Soutello, Dayane Sarmento Romão, Tábata Alves do Carmo, Giordani Mascoli de Favare, Fernanda Calazans Pagnozzi, Isabela de Almeida Cipriano

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引用次数: 0

Abstract

Helminthiasis in horse breeding stands out due to the damage caused by this infection, which is mainly controlled by anthelmintic drugs. Knowing the population dynamics of helminths in a given region is therefore essential, as environmental conditions have a major impact on the development of these parasites in pastures. The aim of this study was to assess the influence of seasonality on helminths. It was carried out between October and September of the years 2015/2016, 2018/2019 and 2021/2022. A total of 147 animals were used, 64 females and 83 males, all from the same herd. Fecal samples were collected directly from the rectal ampulla of each animal every 28 days for 12 months of each cycle for coproparasitological analysis. Average air temperature, average relative humidity and rainfall were measured daily. The weather records were collected by the Agroclimatological Station in Castilho, SP (21o 05' 12.4" S; 51o 35' 17.2" W), located six kilometers from the experiment site. In the three study cycles, the EPG and rainfall averages showed significant differences between the times of year. In general, the month with the highest EPG in the different cycles was February, with 1626 in 2015/2016, 926.7 in 2018/2019 and 1885 in 2021/2022, and the month with the lowest average EPG was July, with 642 in 2015/2016, 610.5 in 2018/2019 and 804 in 2021/2022. Regarding climatic conditions, rainfall was more concentrated in two seasons, spring and summer, meaning that summer was the season with the highest rainfall in the three cycles evaluated. Autumn, followed by winter were the seasons with the lowest rainfall during the cycles studied. It can be concluded that climatic conditions have a direct influence on the population dynamics of helminths, and that during the drier and colder seasons, horses were less affected, so the suggestion for a possible strategic program would be to concentrate the administration of anthelmintics in spring and summer.

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巴西自然感染马胃肠道蠕虫的季节性动态

由于这种感染所造成的损害，在马养殖业中寄生虫病尤为突出，这种感染主要由驱虫药控制。因此，了解特定地区的蠕虫种群动态至关重要，因为环境条件对这些寄生虫在牧场的发展有重大影响。本研究的目的是评估季节对蠕虫的影响。该研究在2015/2016年、2018/2019年和2021/2022年的10月至9月期间进行。共有147只动物被使用，64只雌性和83只雄性，都来自同一畜群。每周期12个月，每28天直接从动物直肠壶腹处采集粪便进行粪寄生虫学分析。每天测量平均气温、平均相对湿度和降雨量。气象记录由SP Castilho农业气候站收集(210 05' 12.4" S；551 - 35' 17.2" W)，距离实验地点6公里。在三个研究周期中，EPG和平均降雨量在一年中的时间之间存在显著差异。总体而言，不同周期EPG最高的月份为2月，2015/2016年为1626,2018/2019年为926.7,2021/2022年为1885；平均EPG最低的月份为7月，2015/2016年为642,2018/2019年为610.5,2021/2022年为804。在气候条件上，降雨更集中在春季和夏季两个季节，即夏季是三个周期中降雨量最多的季节。在研究的周期中，秋季和冬季是降雨量最少的季节。结果表明，气候条件对马的种群动态有直接影响，而在干旱和寒冷季节，马受影响较小，因此建议在春夏两季集中施药。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Veterinary parasitology 农林科学-寄生虫学

CiteScore

5.30

自引率

7.70%

发文量

126

审稿时长

36 days

期刊介绍： The journal Veterinary Parasitology has an open access mirror journal,Veterinary Parasitology: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. This journal is concerned with those aspects of helminthology, protozoology and entomology which are of interest to animal health investigators, veterinary practitioners and others with a special interest in parasitology. Papers of the highest quality dealing with all aspects of disease prevention, pathology, treatment, epidemiology, and control of parasites in all domesticated animals, fall within the scope of the journal. Papers of geographically limited (local) interest which are not of interest to an international audience will not be accepted. Authors who submit papers based on local data will need to indicate why their paper is relevant to a broader readership. Parasitological studies on laboratory animals fall within the scope of the journal only if they provide a reasonably close model of a disease of domestic animals. Additionally the journal will consider papers relating to wildlife species where they may act as disease reservoirs to domestic animals, or as a zoonotic reservoir. Case studies considered to be unique or of specific interest to the journal, will also be considered on occasions at the Editors'' discretion. Papers dealing exclusively with the taxonomy of parasites do not fall within the scope of the journal.