Sheep production is an important socioeconomic activity for the small producers and it can represent their primary income source. Gastrointestinal parasites have become the principal limiting factor for this industry around the world, especially because of the anthelmintic resistance phenomenon that has been increasing worldwide. The negligent use of anthelmintics has been reported as the main factor in the development of resistance. Among the parasites that infect sheep, H. contortus is considered the most harmful and also the parasite responsible for the fastest development of nematode resistance in small ruminants. Due to the economic impact this parasite may bring upon producers, the search for alternative methods of control has become a necessity. The use of condensed tannin containing forages and copper oxide wired particles have been shown to produce promising results. Studies have shown that both of these control methods can reduce fecal egg counts, worm fecundity, egg hatchability and larvae development of H. contortus. The general objective of this research was to evaluate the effect of inorganic copper and condensed tannins on fecal egg counts of naturally infected animals and consisted of three trials. No significant differences were observed in the trials using condensed tannins as the main effect in parasite control (p>0.05). It was possible to observe that the number of H. contortus larvae decreased in the treated group, but the differences were not significant (p>0.05). A significant difference in fecal egg counts in the inorganic copper trial was observed (p<0.05). The copper oxide group yielded the greater reduction throughout the study (p<0.001). Copper sulfate was able to reduce fecal egg counts but there was no difference between this group and the control group, which did not receive any treatment (p>0.05). The use of condensed tannins did not show reductions in parasite load, but its use should not be discarded especially in areas where the use of anthelmintics is no longer possible. Inorganic copper has been shown to reduce GIN infection and its concomitant use with other control methods may represent a useful tool in controlling parasites.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-06292011-105339 |
| Date | 07 July 2011 |
| Creators | Martins, Moara de Santana |
| Contributors | Miller, James E., Hesp, Patrick A., Navarre, Christina B., Williams, Cathleen C. |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-06292011-105339/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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