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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Resistance of sheep from different genetic groups to gastrointestinal nematodes in the state of Sao Paulo, Brazil

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Goncalves, T. C. [1] ; Alencar, M. M. [2] ; Giglioti, R. [1] ; Bilhassi, T. B. [1] ; Oliveira, H. N. [1] ; Rabelo, M. D. [2] ; Esteves, S. N. [2] ; Oliveira, M. C. S. [2]
Total Authors: 8
[1] Univ Estadual Paulista, Fac Ciencias Agr & Vet, Via Acesso Prof Paulo Donato Castellane S-N, BR-14884900 Jaboticabal, SP - Brazil
[2] Embrapa Pecuaria Sudeste CPPSE, Rod Washington Luiz, Km 234, CP 339, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Small Ruminant Research; v. 166, p. 7-11, SEP 2018.
Web of Science Citations: 0

Infections by gastrointestinal nematodes cause large losses to sheep breeders. In the study reported here, the resistance to gastrointestinal nematodes was analyzed in sheep of adapted and non-adapted breeds, maintained in naturally infected pastures. A total of 134 females from seven genetic groups were monitored during 20 months: Santa Ines (OSI), Dorper (ODO), Texel (OTX), Ile de France (OIF), and animals from crosses of Santa Ines ewes with Dorper (ODS), Texel (OTS) and Ile de France (OIS) rams. Blood samples were collected monthly to determine the packed cell volume (PCV), and feces were collected at the same time to count the eggs per gram (fecal egg counts = FEC) and identify the genera of the prevalent parasites. The statistical analyses of the data showed significant differences (p < 0.05) regarding the genetic group, collection month and interaction of month with the genetic group on the FEC. The correlation estimates between FEC and PCV were negative and significant (p < 0.01). The OTS genetic group presented the lowest mean of FEC value. Concerning the nematode genera, the greatest prevalence was observed for Haemonchus spp. (85.6%), followed by Trichostrongylus spp. (10.8%), Oesophagostomum spp. (2.9%) and Cooperla spp. (0.7%). The results obtained in this study show that the crossing of the Texel and Santa Ines breeds can be considered an alternative for sheep production in the Southeast region of Brazil due to the lower egg output by gastrointestinal nematodes. (AU)

FAPESP's process: 11/51564-6 - Crossbreeding and management strategies to optimize maternal and reproductive performance of female sheep, for the production of high quality sheep meat and leather, in the Southeast region of Brazil
Grantee:Maurício Mello de Alencar
Support type: Research Projects - Thematic Grants