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Abstract

Ectoparasites have a detrimental impact on production and performance of cattle. However, the mechanisms involved are not completely understood. Parasitic infestations often lead to decreased appetite or else feed is utilized less efficiently. Presence of ectoparasites may increase metabolic rate,...

Author(s)
Craig, M. E.; Byford, R. L.; Knapp, F. W.
Citation
Recent Research Developments in Entomology, 1998, 2, pp 103-111
Abstract

The effects of varying densities of A. americanum on measured physiological parameters of crossbred Angus beef cattle in a controlled environment was determined. Steers were infested with either 0, 20, 60 or 120 pairs of adult ticks. Heart rate, respiration, rectal temperature, faecal and urine...

Author(s)
Willis, D. C.; Knapp, F. W.; Boling, J. A.; Burg, J. G.
Citation
Journal of Economic Entomology, 1995, 88, 6, pp 1679-1683
Abstract

Slow release formulations of 375, 750 and 1125 mg (a.i.) in 50-g boluses and a subcutaneous injectable formulation (0.2 mg a.i./kg body weight) of moxidectin (CL301423), a compound with ivermectin-like activity, were tested for the control of S. capillatus and B. bovis. S. capillatus populations...

Author(s)
Webb, J. D.; Burg, J. G.; Knapp, F. W.
Citation
Journal of Economic Entomology, 1991, 84, 4, pp 1266-1269
Abstract

A portable automatic sprayer, actuated when cattle obtain minerals, was tested against face flies (Musca autumnalis) and pyrethroid-resistant horn flies (Haematobia irritans) using 0.5% a.i. dichlorvos in a water spray mixture. Horn fly populations were initially 48-fold resistant to permethrin...

Author(s)
Knapp, F. W.; Webb, J. D.
Citation
Journal of Agricultural Entomology, 1992, 9, 4, pp 273-281
Abstract

Physiological and nutritional responses were measured in (predominantly Angus) beef steers exposed to laboratory infestations of Stomoxys calcitrans. Calves (n = 6 per treatment) were infested with 4 levels of stable flies for 3 periods daily (15 min each period) for 14 days. Steers exposed to 0,...

Author(s)
Estienne, M. J.; Knapp, F. W.; Boling, J. A.; Burg, J. G.
Citation
Journal of Economic Entomology, 1991, 84, 4, pp 1262-1265
Abstract

The effect of treatment with trichlorfon, fenthion, famphur or phosmet at recommended dosages on physiological and nutritional indices of cattle infested with Hypoderma spp. and uninfested cattle was determined in laboratory studies in the USA. The parameters used as indicators of general stress...

Author(s)
Schwinghammer, K. A.; Knapp, F. W.; Boling, J. A.
Citation
Journal of Economic Entomology, 1985, 78, 1, pp 96-101
Abstract

A change-over design with complete balance for first residual effects was used with a tethered grazing technique to evaluate the effects of arthropod ectoparasites on the behaviour of adult Angus beef cows (Bos taurus) (body weight (BW), 465±30 kg) grazing vegetative tall fescue (Festuca...

Author(s)
Dougherty, C. T.; Knapp, F. W.; Burrus, P. B.; Willis, D. C.; Burg, J. G.; Cornelius, P. L.; Bradley, N. W.
Citation
Applied Animal Behaviour Science, 1993, 35, 3, pp 215-233
Abstract

The potential of 10% diflubenzuron boluses in the reticulum of cattle for the control of the immature stages of dung-breeding flies was investigated in North America in 1979-80. A sustained-release bolus was highly effective in preventing development of the muscids Haematobia irritans and Musca...

Author(s)
Miller, J. A.; Knapp, F. W.; Miller, R. W.; Pitts, C. W.; Weintraub, J.
Citation
Journal of Agricultural Entomology, 1986, 3, 1, pp 48-55
Abstract

Four groups of eight Hereford and Hereford crossbred steers were monitored for the efficacy of monensin as a feed additive against the face fly (Musca autumnalis) and horn fly (Haematobia irritans). Groups were assigned randomly to grass-clover pastures. Two groups were supplemented with 1.1 kg...

Author(s)
Herald, F.; Knapp, F. W.; Brown, S.; Bradley, N. W.
Citation
Journal of Animal Science, 1982, 54, 6, pp 1128-1131
Abstract

Specific physiological and nutritional responses of beef steers to combined infestations of Haematobia irritans and Stomoxys calcitrans were measured in the laboratory. Measurements used as indicators of physiological stress were changes in heart rate, respiration rate and rectal temperature....

Author(s)
Schwinghammer, K. A.; Knapp, F. W.; Boling, J. A.
Citation
Journal of Economic Entomology, 1987, 80, 1, pp 120-125

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