Sazonalidade da mosca-dos-chifres, Haematobia irritans, no semiárido brasileiro

Medeiros, Márcia Alves de; Barros, Antônio Thadeu Medeiros de; Medeiros, Rosane M.T.; Vieira, Vanessa Diniz; Azevêdo, Sérgio Santos de; Riet-Correa, Franklin

doi:10.1590/1678-5150-pvb-5531

Cited by 3 publications

(1 citation statement)

References 13 publications

(26 reference statements)

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“…During the counts, the cows were contained in a squeeze chute. Total infestation was estimated by counting the flies on one side of each cow and multiplying by two according to the technique described by Morrison & Foil (1995) and Medeiros et al (2018).…”

Section: Data Collectionmentioning

confidence: 99%

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

Medeiros

Barros

Riet-Correa

et al. 2019

Rev. Bras. Parasitol. Vet.

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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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Section: Data Collectionmentioning

confidence: 99%