Identification of Sindhi cows that are susceptible or resistant to Haematobia irritans

Author:

Medeiros Márcia Alves de1,Barros Antonio Thadeu Medeiros de2,Riet-Correa Franklin3,Marques Ana Rita4,Lopes José Radmácyo Gomes5,Vieira Vanessa Diniz5,Miraballes Cecilia4ORCID

Affiliation:

1. Universidade Federal de Campina Grande, Brasil; Centro Universitário Ritter dos Reis, Brasil

2. Empresa Brasileira de Pesquisa Agropecuária, Brasil

3. Universidade Federal de Campina Grande, Brasil; Instituto Nacional de Investigación Agropecuaria, Uruguay

4. Instituto Nacional de Investigación Agropecuaria, Uruguay

5. Universidade Federal de Campina Grande, Brasil

Abstract

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.

Publisher

FapUNIFESP (SciELO)

Subject

General Veterinary,Parasitology

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