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Vilela VLR, Feitosa TF, Bezerra RA, Klafke GM, Riet-Correa F. Multiple acaricide-resistant Rhipicephalus microplus in the semi-arid region of Paraíba State, Brazil. Ticks Tick Borne Dis 2020; 11:101413. [DOI: 10.1016/j.ttbdis.2020.101413] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2019] [Revised: 01/22/2020] [Accepted: 03/08/2020] [Indexed: 12/31/2022]
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Melo LRB, Medeiros MA, Beserra LAF, Barros ATM, Riet-Correa F, Azevedo SS, Vilela VLR. Development and number of generations of Haematobia irritans (Diptera: Muscidae) in bovine fecal masses in the semiarid region of Brazil. Vet Parasitol Reg Stud Reports 2020; 20:100411. [PMID: 32448539 DOI: 10.1016/j.vprsr.2020.100411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 04/08/2020] [Accepted: 04/13/2020] [Indexed: 10/24/2022]
Abstract
The horn fly (Haematobia irritans) is particularly unique among the parasites that primarily affect Brazilian cattle farming. Appropriate control strategies fundamentally depend on epidemiological knowledge, which is particularly scarce in Northeastern Brazil. This study aimed to elucidate the ecology of the immature horn fly in the semiarid region of Brazil. Bovine fecal masses were collected and covered with emergence traps to collect the horn fly for sexing and counting. Weather records of the region were concurrently acquired. A total of 11,390H. irritans were collected from 601 fecal masses, with a sex ratio of 0.9:1 (male: female). Horn fly emergence was observed in 78% (15%-100%) of the fecal masses, varying from 1 to 185 (mean = 23.3) flies/fecal mass, predominantly at the beginning of the rainy season. The minimum period for egg-to-adult development of H. irritans varied from 7 to 11 days, indicating the occurrence of 30 generations per year in the region. Rapid development of the immature horn fly in the semiarid region, throughout the year may results in a high number of generations and infestations in cattle herds.
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Affiliation(s)
- Lídio Ricardo Bezerra Melo
- Programa de Pós-Graduação em Ciência e Saúde Animal, Universidade Federal de Campina Grande (UFCG), Avenida Universitária s/n. Patos, Paraíba, Brazil
| | - Márcia Alves Medeiros
- Programa de Pós-Graduação em Ciência e Saúde Animal, Universidade Federal de Campina Grande (UFCG), Avenida Universitária s/n. Patos, Paraíba, Brazil
| | - Lucas Alencar Fernandes Beserra
- Programa de Pós-Graduação em Ciência e Saúde Animal, Universidade Federal de Campina Grande (UFCG), Avenida Universitária s/n. Patos, Paraíba, Brazil
| | | | - Franklin Riet-Correa
- Programa de Pós-Graduação em Ciência e Saúde Animal, Universidade Federal de Campina Grande (UFCG), Avenida Universitária s/n. Patos, Paraíba, Brazil; Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Salud Animal, Estación Experimental INIA Tacuarembó, Ruta 5 km 386, Tacuarembó, Uruguay
| | - Sérgio Santos Azevedo
- Programa de Pós-Graduação em Ciência e Saúde Animal, Universidade Federal de Campina Grande (UFCG), Avenida Universitária s/n. Patos, Paraíba, Brazil
| | - Vinícius Longo Ribeiro Vilela
- Programa de Pós-Graduação em Ciência e Saúde Animal, Universidade Federal de Campina Grande (UFCG), Avenida Universitária s/n. Patos, Paraíba, Brazil; Departamento de Medicina Veterinária, Instituto Federal da Paraíba (IFPB), Avenida Presidente Tancredo Neves s/n. Sousa, Paraíba, Brazil.
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Medeiros MAD, Barros ATMD, Riet-Correa F, Marques AR, Lopes JRG, Vieira VD, Miraballes C. Identification of Sindhi cows that are susceptible or resistant to Haematobia irritans. ACTA ACUST UNITED AC 2019; 28:465-472. [PMID: 31483037 DOI: 10.1590/s1984-29612019066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Accepted: 07/25/2019] [Indexed: 11/21/2022]
Abstract
To identify susceptible and resistant Haematobia irritans cows, horn flies were counted biweekly for 3 years in a herd of 25 Sindhi cows. Repeated measures linear mixed models were created including cow as a random factor. The results were analyzed by: 1) observing horn fly counts, considering fly-susceptible cows with infestations appearing in the upper quartile more than 50% of the weeks and in the lower quartile less than 20% of the weeks, and fly-resistant cows those that the number of flies was in the lower quartile more than 50% of the weeks and in the upper quartile less than 20%; 2) by the best linear unbiased predictions (BLUPs), to evaluate the cow effect on fly counts. Fly-susceptible cows were those in which the infestation appeared in the 90th percentile of the BLUPs, whereas fly-resistant cows appeared in the 10th percentile. For the observational method the individuals identified as resistant varied between 8% and 20% and 8% to 12% were susceptible. For the BLUP method, the rates of susceptible and resistant cows were 12%. The agreement among methods suggests that susceptible cows can be identified by observations of fly counts, allowing for selective breeding, culling or treatment.
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Affiliation(s)
- Márcia Alves de Medeiros
- Hospital Veterinário, Centro de Saúde e Tecnologia Rural - CSTR, Universidade Federal de Campina Grande - UFCG, Patos, PB, Brasil.,Departamento de Medicina Veterinária, Centro Universitário Ritter dos Reis - UNIRRITER, Porto Alegre, RS, Brasil
| | | | - Franklin Riet-Correa
- Hospital Veterinário, Centro de Saúde e Tecnologia Rural - CSTR, Universidade Federal de Campina Grande - UFCG, Patos, PB, Brasil.,Plataforma de Salud Animal - PSA, Instituto Nacional de Investigación Agropecuaria - INIA, Tacuarembó, Uruguay
| | - Ana Rita Marques
- Plataforma de Salud Animal - PSA, Instituto Nacional de Investigación Agropecuaria - INIA, Tacuarembó, Uruguay
| | - José Radmácyo Gomes Lopes
- Hospital Veterinário, Centro de Saúde e Tecnologia Rural - CSTR, Universidade Federal de Campina Grande - UFCG, Patos, PB, Brasil
| | - Vanessa Diniz Vieira
- Hospital Veterinário, Centro de Saúde e Tecnologia Rural - CSTR, Universidade Federal de Campina Grande - UFCG, Patos, PB, Brasil
| | - Cecilia Miraballes
- Plataforma de Salud Animal - PSA, Instituto Nacional de Investigación Agropecuaria - INIA, Tacuarembó, Uruguay
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