Non-hierarchical cluster analysis for determination of resistance to worm infection in meat sheep.

Tropical Animal Health and Production
Johnny Iglesias Mendes AraujoJosé Lindenberg Rocha Sarmento

Abstract

The aim of this study was to determine the resistance to worm infection in Santa Inês sheep by combining different sets of gastrointestinal parasite resistance indicator traits, using the k-means algorithm. Records from 221 animals reared in the Mid-North sub-region of Brazil were used. The following phenotypes were used: hematocrit (HCT); white blood cell count; red blood cell count (RBC); hemoglobin (HGB); platelets; mean corpuscular hemoglobin; mean corpuscular volume; mean corpuscular hemoglobin concentration; fecal egg count (FEC); coloration of the ocular mucosa (FAMACHA score); body condition score (BCS); withers height; and rump height. Two files with phenotypic information of animals were edited: complete, including all traits, and reduced, in which only FAMACHA score, HCT, FEC, and BCS were used. For determination of worm resistance, three groups were formed using the k-means non-hierarchical clustering by combining the traits of the complete and reduced analyses. The animals of the group in which individuals had the lowest values for FEC and FAMACHA score, as well as the highest values for HCT, RBC, HGB, and BCS were classified as resistant. In the group with opposite values for the aforementioned traits, the animals...Continue Reading

References

Oct 1, 1987·International Journal for Parasitology·G A AlbersI A Barger
Dec 31, 2009·Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária·César Cristiano BassettoAlessandro Francisco Talamini do Amarante
Dec 19, 2012·Frontiers in Genetics·Stephen C Bishop
Sep 8, 2017·Journal of Animal Science and Biotechnology·Mariana Piatto BertonJosé Bento Sterman Ferraz

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Software Mentioned

R
skmeans
R Core Team
SAS®

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Anthelmintics

Anthelmintics or antihelminthics are a group of antiparasitic drugs that expel parasitic worms (helminths) and other internal parasites from the body by either stunning or killing them and without causing significant damage to the host. Discover the latest research on anthelmintics here.

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