The Effect of Gastrointestinal Nematode Infection Level on Grazing Distance from Dung
| Autor: | Hizumi Lua Sarti Seó, Luiz Carlos Pinheiro Machado Filho, Patrizia Ana Bricarello, Bruna Fernanda da Silva, Alessandro Fernando Talamini do Amarante, Luciana Aparecida Honorato |
|---|---|
| Přispěvatelé: | Universidade Federal de Santa Catarina (UFSC), Universidade do Planalto Catarinense (UNIPLAC), Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Male
Parasitism lcsh:Medicine Cattle Diseases Biology Models Biological Feces Animal science Grazing Parasite Egg Count medicine Animals Anthelmintic Herbivory lcsh:Science Nematode Infections Larva Herbivore Multidisciplinary Host (biology) lcsh:R Immunology lcsh:Q Cattle medicine.drug Research Article |
| Zdroj: | PLoS ONE PLoS ONE, Vol 10, Iss 6, p e0126340 (2015) Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 1932-6203 |
| Popis: | Made available in DSpace on 2015-10-21T13:11:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-06-03. Added 1 bitstream(s) on 2015-10-22T09:52:14Z : No. of bitstreams: 1 WOS000355700700027.pdf: 574417 bytes, checksum: f70d7f659234df7685bd0497814d2409 (MD5) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Avoiding grazing near feces is an efficient strategy to prevent parasitic infection and contamination; therefore, in the evolution of herbivorous species, this behavior may have developed as a mechanism to protect the host against infection by gastrointestinal nematodes. The aim of this study was to assess whether grazing distance from dung is related to the level of parasitic infection in cattle. Based on Fecal Egg Count (FEC) means, 18 castrated male steers, aged 18 months, were divided into three groups: High (FEC >= 315); Medium (FEC = 130-160); and Low (FEC = 40-70). To analyze the response to a new natural infection by gastrointestinal nematodes and to standardize infection levels, all animals received anthelmintic treatment at twenty days prior to field observation. Three observers simultaneously collected data on grazing behavior for 2.5 hours/week for 12 weeks. Observers recorded the distance when grazing occurred at less than one meter from dung. Every two weeks, fecal samples were collected for FEC, as well as serum samples to measure immunoglobulin G (IgG) levels against larvae and adult antigens of the parasitic species Haemonchus placei. All groups grazed farther from the dung on days of greater insolation (r = 0.62; P = 0.03). Animals with high levels of parasitism grazed farther from the dung (P < 0.05) but had lower levels (P < 0.0001) of IgG serum levels compared to those with medium and low levels of infection. FEC values varied over the experiment, remaining below 200 for the low and medium group and reaching 1000 (P < 0.01) for the animals with the highest rates of parasitism. Our results indicate that cattle showing high levels of parasitism are more likely to avoid contaminated areas than animals with lower infection levels, and the immune system seems to be involved in such behavior. Univ Fed Santa Catarina, Lab Etol Aplicada Bem Estar Anim, Dept Zootecnia Desenvolvimento Rural, Florianopolis, SC, Brazil Univ Planalto Catarinense, Lages, Brazil UNESP Univ Estadual Paulista, Inst Biociencias, Dept Parasitol, Botucatu, SP, Brazil Univ Fed Santa Catarina, Lab Parasitol Anim, Dept Zootecnia Desenvolvimento Rural, Florianopolis, SC, Brazil UNESP Univ Estadual Paulista, Inst Biociencias, Dept Parasitol, Botucatu, SP, Brazil CNPq: 562908/2010-2 CNPq: 22/2010 |
| Databáze: | OpenAIRE |
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