Variation in the load of the horn fly, Haematobia irritans, in cattle herds is determined by the presence or absence of individual heifers

Medical and Veterinary Entomology
K-M V JensenChristine M Woodcock

Abstract

The distribution of horn flies, Haematobia irritans (L.) (Diptera: Muscidae), in herds of Danish Holstein-Friesian cattle was investigated in two studies conducted during two field seasons. In the first study, highly significant differences in fly distribution between the most and the least fly-susceptible heifers were observed. In one herd, the mean difference between the most fly-susceptible and the most fly-resistant heifers was 268 Ha. irritans specimens. The highest ratio between upper and lower mean fly number was 64.1:1, whereas the lowest was 3.1:1. In the second year, it was demonstrated that the heifers kept their rank in fly attraction over time. The trial clearly demonstrated that some heifers were attracting flies, whereas others, even in the same herd, only carried a few. In the second study, heifers were moved in and out of herds in an attempt to manipulate fly loads in the herds. In year 1, one herd (herd A) received four fly-resistant heifers from another herd (herd B), resulting in a drop in the mean number of flies, whereas herd B received four fly-susceptible heifers from herd A, resulting in an elevation of the mean number of flies. In year 2, a similar pattern emerged using herds C and D, and when the catt...Continue Reading

References

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Citations

Apr 9, 2010·Die Naturwissenschaften·Paul J Weldon
Feb 2, 2010·Journal of Chemical Ecology·John A PickettWalter S Leal
Jul 27, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Ahmed HassanaliChristine M Woodcock
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Sep 5, 2019·Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária·Márcia Alves de MedeirosCecilia Miraballes
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Nov 1, 2020·Animals : an Open Access Journal From MDPI·Jacqueline Poldy

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